Horticultural Lighting 240cm x 120cm - 2.88m² for Other Uses
Lighting a 240cm x 120cm - 2.88m² surface for uses other than classic cultivation requires a specific approach. Whether for cloning, propagation, drying, or experimentation, this rectangular area needs uniform lighting tailored to your particular needs.
Why choose specialized lighting for this surface
A 2.88m² rectangular surface presents challenges in light uniformity. Unlike square spaces, you need to manage distribution over 240cm in length while maintaining homogeneous coverage over 120cm in width. Modern horticultural LEDs excel in this area thanks to their controlled beam angle and low heat emission.
For other uses, the main advantage lies in modularity. You can adjust the intensity according to your specific needs: 200-300 µmol/m²/s for cloning, 400-600 µmol/m²/s for propagation, or even create differentiated lighting zones on your surface. This flexibility is impossible with traditional HPS systems, which generate too much heat and lack precision.
How to choose your lighting for 2.88m²
The recommended power varies depending on the use: count 25-30W/m² for LED for light cloning, 35-45W/m² for active propagation, and up to 50-60W/m² if you want to maintain vigorous mother plants. For 2.88m², this represents between 70W and 170W depending on your objectives.
The choice between a single lamp or multiple modules depends on your setup. A 240cm LED bar offers perfect linear coverage, while 2-3 square 60x60cm panels allow for more modularity. Installation height also plays a role: between 30-50cm for cloning, 40-70cm for general propagation.
Regarding spectrum, opt for a 3000K-4000K full spectrum for other uses. This is more versatile than a specialized spectrum and allows you to adapt the lighting according to your experiments. LEDs with an integrated dimmer are a definite plus for this flexibility.
Frequently Asked Questions
Which LED lamp should I choose to cover exactly 240cm x 120cm during the vegetative phase?
For this rectangular surface, opt for a 240cm LED bar with a PPFD of 400-600 µmol/m²/s. Samsung LM301B or Osram models offer excellent uniformity over this length. Install the lamp at a height of 50-60cm for homogeneous coverage. An alternative is to use 3 panels of 80x60cm spaced regularly, which allows for finer control of lighting by zone.
What height should the lamp be installed above the plants for 2.88m² without burning the leaves?
The optimal height depends on the power: 30-40cm for 100-150W LEDs, 50-70cm for 200-300W. Monitor the leaf temperature with an infrared thermometer – it should not exceed 26-28°C. Quality LEDs allow for lower placement than HPS due to their low heat emission. Always start higher and gradually lower, observing the plants' reaction.
LED or HPS, which is better for other uses on this surface?
LEDs largely dominate for other uses on 2.88m². They consume 40-50% less energy, emit less heat, and offer precise spectral control. For cloning or propagation, this precision is crucial. A 400W HPS would generate too much heat for this enclosed space, while a 150-200W full spectrum LED yields better results. The only HPS advantage remains the initial cost, but LED energy savings quickly compensate.
How to maintain a horticultural lamp for 240x120cm and what is its lifespan?
Maintenance is limited to monthly dusting with a dry or slightly damp cloth. Avoid chemicals on LEDs. Check electrical connections every 6 months. A quality LED lasts 50,000 to 100,000 hours, or 5-10 years with intensive use 12 hours/day. Drivers are often the weak point – choose reputable brands like Meanwell. Monitor light degradation: if intensity drops by 20%, it's time to replace.
How many watts are needed for good flowering on 2.88m² in indoor cultivation?
For optimal flowering on 2.88m², aim for 45-55W/m² in LED, or 130-160W total. This corresponds to 800-1000 µmol/m²/s of PPFD, ideal for maximizing production. With HPS, it would require 400-600W, but heat becomes unmanageable on this surface. 3000K full spectrum LEDs are perfect for flowering. Add CO2 if possible to fully utilize this high light intensity.
