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 Growing 20 W · Vegetative growth · 6500 K · 47 cm. Compatible 24 V DC power supply sold separately.
Often bought together
Secret Jardin Cosmorrow Growing 20 W… 29,90 €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 Growing 20 W...
29,90 €
Parraine tes proches
5 % pour toi & 5 % pour ton ami
Description
Product presentation
Secret Jardin · Cosmorrow Growing 20 WLight where it is needed.
Light where it is needed.
The right format for your plants.
The Cosmorrow Growing 20 W provides 20 W lighting for seedlings, cuttings and vegetative growth. Its linear format lets you place light above or beside the growing area. Compatible 24 V DC power supply sold separately.
20 WVegetative growth · 6500 KSeparate power supply
20 WNominal power
47 cmBar length
24 V DCBar input
Vegetative growth · 6500 K 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.
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.
Vegetative growth · 6500 K
6500 K white light is intended for seedlings, cuttings and vegetative growth. Choose flowering lighting according to your plants’ actual needs.
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
Adjust to the crop
Follow your version’s instructions, observe plants and measure temperature. A distance used in a test is not a universal rule.
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 | Vegetative growth · 6500 K |
| Physical length | 47 cm |
| Bar supply | 24 V DC |
| Power supply included | No |
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 →Light where it is needed.
Check dimensions, included items and connections before ordering.
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Frequently asked questions
Your questions
Hello, could you specify if the Cosmorrow Growing 20W 50cm LED bar, with its 6500K spectrum, is also suitable for the flowering phase or only for growth? Additionally, which Cosmorrow power supply do you recommend for a double 2x20W installation with uniform lighting?
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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.
The 47 cm bar exceeds the longest stated side (20 cm): a straight mounting along that side will not fit. Check another orientation and clearances before buying. 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.
Install with power disconnected, using the intended fittings and checking support strength. Allow room for cables and moving neighbouring equipment. Straightforward assembly still requires following the exact model’s instructions.
Compatible with standard power supply or only with Cosmorrow power supply?
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.
Is the Cosmorrow compatible power supply easy to find? Can two bars be connected in series without any issues?
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.
Install with power disconnected, using the intended fittings and checking support strength. Allow room for cables and moving neighbouring equipment. Straightforward assembly still requires following the exact model’s instructions.
Does the Cosmorrow Growing 20W 6500K LED bar guarantee a better thermal efficiency ratio per watt compared to CMH 315W lamps to limit heat in a confined space?
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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.
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.
Does the Cosmorrow Growing 20W LED bar require a specific power supply or can it work with a standard power supply?
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.
How is passive cooling managed on the Cosmorrow Growing 20W LED bar under high humidity conditions to avoid overheating or performance drop?
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.
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.
Is this 20W 6500K LED bar suitable for a complete growth cycle in hydroponics, or should it be combined with other types of lights for better performance?
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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.
Can the Cosmorrow Growing 20W 50cm LED bar be connected in parallel to increase the illuminated area without overloading the specific power supply?
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.
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.
Is a beginner kit with included power supply available? Is the LED easy to connect and plug in directly? How long before I see a good explosive growth with this bar?
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 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.
Install with power disconnected, using the intended fittings and checking support strength. Allow room for cables and moving neighbouring equipment. Straightforward assembly still requires following the exact model’s instructions.
What surface area do you recommend covering with a Cosmorrow Growing 20W 50cm LED bar in terms of optimized yield and plant density before light saturation?
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 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.
What quantity of Cosmorrow Growing 20W LED bars do you recommend to optimize growth in a 1m2 greenhouse space without increasing the ambient temperature?
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.
Does the Cosmorrow Growing 20W 50cm LED bar support continuous use for several months without performance degradation or failure of the timer or specific power supply?
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.
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.
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. Independent schedules require separate control circuits.
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.
What is the average lifespan of this Cosmorrow Growing 20W LED bar and its luminous efficiency over time?
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 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.
Is the Cosmorrow Growing 20W LED bar in 6500K suitable for the growth phase in hydroponics and what is its electricity consumption compared to a conventional lamp?
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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.
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.
Is the Cosmorrow 20W LED bar compatible with a standard power supply or does it require a proprietary one?
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.
Is the Cosmorrow 20W 50cm LED Bar effective for rooting in micro spaces with high humidity levels?
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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 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.
What is the precise electrical consumption of the Cosmorrow Growing 20W LED bar over 1m² and the actual luminous efficiency for maximum indoor growth with 6500K?
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.
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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.
Is the passive heatsink really sufficient to avoid overheating during continuous use?
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.
What is the luminous efficiency in lumens per watt of the Cosmorrow Growing 20W 50cm LED bar at 6500K and its electrical consumption compared to a traditional horticultural lamp for a growing space of 1.5m by 1.5m with an optimal growth goal and maximum energy savings?
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.
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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.
What is the light yield in micromoles per joule of the Cosmorrow Growing 20W 50cm LED bar at 6500K and how does this yield translate to plant growth over a cultivation area of 1.5x1.5 meters?
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.
Growing uses 6500 K white light intended for seedlings, cuttings and vegetative growth. It may also light low-demand flowering plants, but this does not prove that one bar is enough for intensive flowering. Substrate or hydroponic growing does not remove the need to check received light.
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.
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