A format you can position
The bar format lets you arrange several light sources across the setup. Check spacing and light levels at the edges.
Cosmorrow Ultraviolet 20 W · 365 nm UV-A + 6500 K white · 47 cm. Compatible 24 V DC power supply sold separately. Use as a supplement with separate control.
GrowLED since 2009
French group · indoor growing expertise
Pay in instalments
3 or 4 payments from €50 with Alma, subject to eligibility
24h express available
After dispatch, if offered at checkout
Showroom near Nancy (54)
Au Palétuvier · Champigneulles
Secret Jardin Cosmorrow Ultraviolet...
29,89 €
Parraine tes proches
5 % pour toi & 5 % pour ton ami
Description
Product presentation
Secret Jardin · Cosmorrow Ultraviolet 20 WSupplement the spectrum.
Supplement the spectrum.
Keep separate control.
The Cosmorrow Ultraviolet 20 W is a 20 W spectral supplement for a main grow light. It combines 365 nm UV-A + 6500 K white. Use a separately controlled circuit and add a compatible 24 V DC power supply.
20 W365 nm UV-A + 6500 K whiteSeparate power supply
20 WNominal power
47 cmBar length
24 V DCBar input
365 nm UV-A + 6500 K white Light type
Before you choose
Check mounting and power supply
Allow for the 47 cm physical length plus fittings and cables. Usable coverage depends on height, lamp arrangement and plant light requirements. Check the layout before choosing.
The 50 and 90 cm formats have physical bar lengths of 47 and 87 cm. Bar length is not illuminated coverage. Use alongside the main light, never as the sole source. UV-A: avoid direct eye and skin exposure; switch the bar off before working nearby. Prolonged exposure can damage plants. Follow the manufacturer’s UV instructions; no universal exposure time is prescribed here.
What is included
One Cosmorrow LED bar.
What you need to add
Compatible 24 V DC power supply sold separately. Choose an output rated for each 20 W bar, compatible mountings and a timer if needed.
Check my setup →What this means for you
Practical choices for your setup
Choose according to available space, plant stage and existing equipment.
365 nm UV-A + 6500 K white
The supplement changes the spectrum reaching plants. Its effect depends on species, main lighting and exposure; it does not replace the main light.
Separate components
Choose the Cosmorrow bar and power supply separately. A compatible part can be replaced without replacing everything; check the generation and connectors.
Getting started
Install, connect, then observe
01
Mount with power disconnected
Unplug the power supply and use fittings suited to the support. Keep the light and cables secure.
02
Connect compatible parts
Check voltage, rated capacity and connectors before powering on. Never connect a 24 V bar directly to mains.
03
Control UV exposure
UV-A: avoid direct eye and skin exposure; switch the bar off before working nearby. Prolonged exposure can damage plants. Follow the manufacturer’s UV instructions; no universal exposure time is prescribed here.
Looking after your equipment
Unplug and allow to cool before cleaning. Gently remove dust and check fittings and cables. Do not remove a Cosmorrow bar’s transparent sleeve: it is part of its protection.
For comparison
Technical details
Data for the model described. Watts describe power, not coverage or a growing result.
| Nominal power | 20 W |
|---|---|
| Spectrum | 365 nm UV-A + 6500 K white |
| Physical length | 47 cm |
| Bar supply | 24 V DC |
| Power supply included | No |
| LED ratio | 1/3 365 nm · 2/3 6500 K |
Manufacturer sources: Manufacturer documentation · Further manufacturer document · Further documentation
Explore Secret Jardin →Before buying
A question about your setup?
Tell us your light’s model, dimensions and power supply to check compatibility.
Read questions and answers →Supplement the spectrum.
Check dimensions, included items and connections before ordering.
They've adopted it
Reviews customers
Frequently asked questions
Your questions
This Cosmorrow Ultraviolet 20W LED bar is IP65 waterproof and helps improve foliage coloration and density while strengthening the natural defense of plants. My question is: Can this UV bar be used continuously during the entire flowering phase without risking stress to the plants, and how does this affect electricity consumption and thermal management in a 1m² grow box?
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
The IP65 rating of Cosmorrow bars concerns dust and water-jet protection; it does not permit immersion or make every supply and connection waterproof. Keep connections dry and retain the protective sleeve. Hydroponic use does not remove these precautions.
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Nominal power is 20 W: energy = 0.02 kW × operating hours. Without a fixed daily duration, one daily or monthly total would not be justified. Cost depends on your tariff. Measure supply losses and other devices at the outlet; these calculations do not prescribe a photoperiod.
This LED produces heat: low wattage or passive cooling does not mean no heating. Keep components ventilated and measure temperature near foliage. No fixed surface temperature or quantified comparison with another light is verified for all conditions.
Wattage and length alone do not guarantee coverage, plant count or penetration through dense foliage. Check dimensions, then light at the centre and edges for the plant stage. Different species may need different levels or schedules.
Can this 20W ultraviolet LED bar be combined with full spectrum LEDs to maximize growth and defense without increasing heat?
This model combines roughly one third 365 nm UV-A LEDs and two thirds 6500 K white LEDs. It is neither complete main lighting nor a UV-C disinfection lamp. No pest, disease or genetic-resistance result is guaranteed.
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Can I use this 20W ultraviolet LED bar as the only lighting for the entire growth phase, or should I combine it with a full spectrum lamp for optimal results?
This model combines roughly one third 365 nm UV-A LEDs and two thirds 6500 K white LEDs. It is neither complete main lighting nor a UV-C disinfection lamp. No pest, disease or genetic-resistance result is guaranteed.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
What are the concrete benefits of using the Cosmorrow Ultraviolet 20W 50cm LED bar on foliage density and disease resistance compared to standard horticultural lighting?
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
What is the light intensity and penetration depth of the Cosmorrow 20W ultraviolet LED bar for effective cultivation in a 50cm wide box?
The precise figure requested is not confirmed for the revision and measurement conditions in your question. PPF is total emitted photon flux; PPFD is the light received per square metre at a specified distance and grid. No validated map for the height and setup in your question is provided here. Lumens do not convert directly to PAR, and these measurements do not predict grams per watt.
Wattage and length alone do not guarantee coverage, plant count or penetration through dense foliage. Check dimensions, then light at the centre and edges for the plant stage. Different species may need different levels or schedules.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Compatible with standard home automation protocols for easy integration into a lighting and temperature/humidity sensor management system?
No connected control or built-in dimming is documented for this version. A compatible timer or switched outlet can control mains power to the supply; this does not add dimming, spectrum adjustment or temperature/humidity sensing. Check load and inrush-current ratings.
This LED produces heat: low wattage or passive cooling does not mean no heating. Keep components ventilated and measure temperature near foliage. No fixed surface temperature or quantified comparison with another light is verified for all conditions.
The IP65 rating of Cosmorrow bars concerns dust and water-jet protection; it does not permit immersion or make every supply and connection waterproof. Keep connections dry and retain the protective sleeve. Hydroponic use does not remove these precautions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Ultraviolet LED bar 20W real warranty without power degradation for 2 years? IP65 waterproof tested under real greenhouse conditions? Customer service responded quickly in case of problems?
If a fault occurs, contact GrowLED with proof of purchase, model and a description of the fault. Support depends on diagnosis and applicable terms; no replacement time or undocumented electrical protection is promised.
We cannot confirm a real service life without output loss for your use. An hours rating is a reference figure, not a guarantee of unchanged output. Temperature, dust and electrical conditions affect performance; no continuous-use ageing test matching your setup is available here.
The IP65 rating of Cosmorrow bars concerns dust and water-jet protection; it does not permit immersion or make every supply and connection waterproof. Keep connections dry and retain the protective sleeve. Hydroponic use does not remove these precautions.
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Can this 20w 50cm ultraviolet LED bar really strengthen plant defenses without overheating or increasing electricity consumption too much?
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
This LED produces heat: low wattage or passive cooling does not mean no heating. Keep components ventilated and measure temperature near foliage. No fixed surface temperature or quantified comparison with another light is verified for all conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Does the Cosmorrow Ultraviolet 20W LED bar have an efficient cooling system to ensure durability beyond 6 months in intensive use in a humid environment?
This LED produces heat: low wattage or passive cooling does not mean no heating. Keep components ventilated and measure temperature near foliage. No fixed surface temperature or quantified comparison with another light is verified for all conditions.
We cannot confirm a real service life without output loss for your use. An hours rating is a reference figure, not a guarantee of unchanged output. Temperature, dust and electrical conditions affect performance; no continuous-use ageing test matching your setup is available here.
The IP65 rating of Cosmorrow bars concerns dust and water-jet protection; it does not permit immersion or make every supply and connection waterproof. Keep connections dry and retain the protective sleeve. Hydroponic use does not remove these precautions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Does this Cosmorrow Ultraviolet 20W LED bar significantly improve resistance to pest attacks without negatively impacting rapid growth?
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
What is the average lifespan of this ultraviolet LED bar and does it impact plants' long-term sensitivity to diseases?
We cannot confirm a real service life without output loss for your use. An hours rating is a reference figure, not a guarantee of unchanged output. Temperature, dust and electrical conditions affect performance; no continuous-use ageing test matching your setup is available here.
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Can this 20W ultraviolet LED bar be easily combined with a main indoor LED panel to boost growth without overheating?
If a fault occurs, contact GrowLED with proof of purchase, model and a description of the fault. Support depends on diagnosis and applicable terms; no replacement time or undocumented electrical protection is promised.
This LED produces heat: low wattage or passive cooling does not mean no heating. Keep components ventilated and measure temperature near foliage. No fixed surface temperature or quantified comparison with another light is verified for all conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
What is the real impact of the Cosmorrow Ultraviolet 20W LED bar on plant growth and defense compared to standard LED lighting in mixed indoor cultivation?
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Wattage and length alone do not guarantee coverage, plant count or penetration through dense foliage. Check dimensions, then light at the centre and edges for the plant stage. Different species may need different levels or schedules.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Is this 20W 50cm ultraviolet LED bar compatible with a 80x80 grow space without the risk of overheating or excessive electricity consumption?
Wattage and length alone do not guarantee coverage, plant count or penetration through dense foliage. Check dimensions, then light at the centre and edges for the plant stage. Different species may need different levels or schedules.
This LED produces heat: low wattage or passive cooling does not mean no heating. Keep components ventilated and measure temperature near foliage. No fixed surface temperature or quantified comparison with another light is verified for all conditions.
Nominal power is 20 W: energy = 0.02 kW × operating hours. Without a fixed daily duration, one daily or monthly total would not be justified. Cost depends on your tariff. Measure supply losses and other devices at the outlet; these calculations do not prescribe a photoperiod.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
What are the specific effects of ultraviolet light on plant growth and flowering, and can its intensity be regulated to adapt the spectrum according to the phases of cultivation?
This model combines roughly one third 365 nm UV-A LEDs and two thirds 6500 K white LEDs. It is neither complete main lighting nor a UV-C disinfection lamp. No pest, disease or genetic-resistance result is guaranteed.
No connected control or built-in dimming is documented for this version. A compatible timer or switched outlet can control mains power to the supply; this does not add dimming, spectrum adjustment or temperature/humidity sensing. Check load and inrush-current ratings.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Can this 20W 50cm ultraviolet LED bar be used in parallel with a main light source without the risk of overheating or disrupting the light cycle of plants?
This bar needs a compatible 24 V DC supply rated for 20 W per bar, sold separately. A Cosmorrow 1×20 W supply powers one bar and 2×20 W powers two. A third-party supply must match constant voltage, polarity, connector and required capacity.
This LED produces heat: low wattage or passive cooling does not mean no heating. Keep components ventilated and measure temperature near foliage. No fixed surface temperature or quantified comparison with another light is verified for all conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Does the Cosmorrow Ultraviolet 20W LED bar really accelerate the vegetative phase and leaf density in hydroponics or is its effect mainly oriented towards protection against diseases and pests?
The IP65 rating of Cosmorrow bars concerns dust and water-jet protection; it does not permit immersion or make every supply and connection waterproof. Keep connections dry and retain the protective sleeve. Hydroponic use does not remove these precautions.
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
How to effectively integrate the Cosmorrow Ultraviolet 20W LED bar into a differentiated management program to promote growth without disrupting flowering?
No connected control or built-in dimming is documented for this version. A compatible timer or switched outlet can control mains power to the supply; this does not add dimming, spectrum adjustment or temperature/humidity sensing. Check load and inrush-current ratings.
This model combines roughly one third 365 nm UV-A LEDs and two thirds 6500 K white LEDs. It is neither complete main lighting nor a UV-C disinfection lamp. No pest, disease or genetic-resistance result is guaranteed.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
What is the precise consumption of the Cosmorrow Ultraviolet 20W 50cm LED bar in kWh per day for a cultivation area of 1.5m x 1.5m with yield optimization and real impact on the EDF bill with the current increased rate?
Nominal power is 20 W: energy = 0.02 kW × operating hours. Without a fixed daily duration, one daily or monthly total would not be justified. Cost depends on your tariff. Measure supply losses and other devices at the outlet; these calculations do not prescribe a photoperiod.
The precise figure requested is not confirmed for the revision and measurement conditions in your question. PPF is total emitted photon flux; PPFD is the light received per square metre at a specified distance and grid. No validated map for the height and setup in your question is provided here. Lumens do not convert directly to PAR, and these measurements do not predict grams per watt.
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
What is the actual penetration offered by this Cosmorrow 20W ultraviolet LED bar in hydroponic cultivation, and is it effective in stimulating the natural defense of plants in a humid indoor environment?
Wattage and length alone do not guarantee coverage, plant count or penetration through dense foliage. Check dimensions, then light at the centre and edges for the plant stage. Different species may need different levels or schedules.
The precise figure requested is not confirmed for the revision and measurement conditions in your question. PPF is total emitted photon flux; PPFD is the light received per square metre at a specified distance and grid. No validated map for the height and setup in your question is provided here. Lumens do not convert directly to PAR, and these measurements do not predict grams per watt.
The IP65 rating of Cosmorrow bars concerns dust and water-jet protection; it does not permit immersion or make every supply and connection waterproof. Keep connections dry and retain the protective sleeve. Hydroponic use does not remove these precautions.
This light guarantees no yield quantity, growth speed or disease prevention. Species, received light, climate, water and nutrition work together. Comparing HPS, CMH or another LED requires matched test conditions.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Is integration possible with the main home automation systems to control the lighting and programming of this 20W UV LED bar?
No connected control or built-in dimming is documented for this version. A compatible timer or switched outlet can control mains power to the supply; this does not add dimming, spectrum adjustment or temperature/humidity sensing. Check load and inrush-current ratings.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Compatible with home automation management system for remote control?
No connected control or built-in dimming is documented for this version. A compatible timer or switched outlet can control mains power to the supply; this does not add dimming, spectrum adjustment or temperature/humidity sensing. Check load and inrush-current ratings.
No single distance suits every plant and layout. Follow the instructions for the version supplied, allow for mountings and adjust using light and temperature measurements. Side lighting supplements a specific area; it does not guarantee the same distribution as overhead mounting.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
Can the Cosmorrow Ultraviolet 20W 50cm LED bar be used in parallel with a traditional main lighting system without the risk of overexposure or stress for the plants during a two-phase growing rotation?
This bar needs a compatible 24 V DC supply rated for 20 W per bar, sold separately. A Cosmorrow 1×20 W supply powers one bar and 2×20 W powers two. A third-party supply must match constant voltage, polarity, connector and required capacity.
Use this 365 nm UV-A bar only alongside a main light, with separate scheduling. Do not leave it on continuously by default: prolonged exposure can damage plants. Avoid eye and skin exposure and switch it off before working nearby. Define duration using plant-specific guidance and manufacturer instructions, not wattage alone.
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