900W LED Grow Lights

A quality 900W LED typically covers a 5x5 ft area during flowering when hung 18-24 inches above your canopy. For vegetative growth, you can stretch coverage to 6x6 ft since plants need less intense light. The actual footprint depends on the fixture's bar configuration - 8-bar designs distribute light more evenly than 6-bar models, reducing edge falloff.

A 900W LED with 2.7+ µmol/J efficacy delivers comparable or superior PPFD to a 1000W HPS while consuming 10% less electricity and generating significantly less heat. The real savings come from reduced cooling costs - HPS fixtures dump heat directly into your grow space, while LED heat is manageable with proper ventilation and carbon filtration systems. You'll also avoid bulb replacements every grow cycle.

Full-spectrum 900W fixtures work perfectly well for both growth phases without spectrum adjustment - plants will respond to the complete wavelength range throughout their lifecycle. However, 4-channel control gives you the option to emphasize blue wavelengths during veg for tighter node spacing, then shift to red-heavy output during flowering. It's a nice-to-have feature rather than a must-have, especially useful for growers who want to experiment with spectral recipes.

At 120V, a 900W fixture draws approximately 7.5 amps, which is well within a standard 15-amp circuit's capacity. However, when you factor in inline fans, dehumidifiers, and other equipment, you'll quickly approach circuit limits. Running the fixture at 240V (if your driver supports it) drops the amperage draw to roughly 3.75 amps, giving you much more headroom on the circuit. Always have an electrician verify your setup before committing.

Quality 900W fixtures using Samsung LM301 diodes typically maintain 90% of their original output for 50,000+ hours - that's roughly 5-7 years of continuous 18/6 veg schedules. The driver usually fails before the diodes, but reputable manufacturers offer 3-5 year warranties that cover component replacement. Compare this to HPS bulbs that need replacing every 12-18 months, and the long-term value becomes clear.

Absolutely. Seedlings and clones thrive under 25-40% intensity (200-400 µmol/m²/s), while vegetative plants perform well at 50-70% power. Save full 100% output for flowering when plants can actually utilize 800-1000+ µmol/m²/s. Dimming also extends diode lifespan and reduces electricity waste during early growth stages. Learn more about optimizing light intensity in our PPFD guide for indoor growing.

You'll need adjustable rope ratchet hangers rated for at least 40 lbs (900W fixtures typically weigh 25-35 lbs), proper driver extension cords if you're mounting the driver outside your tent, and a reliable timer for your light schedule. Most importantly, verify your tent's crossbars can support the weight - quality grow tents have reinforced support bars specifically for heavy lighting loads.

Despite being "900 watts," modern high-efficiency fixtures typically draw 850-880W from the wall due to driver efficiency. A 2.7 µmol/J fixture converts roughly 60-70% of that energy into light, with the remaining 30-40% becoming heat - that's about 250-350W of thermal output. Compare this to 1000W HPS which converts only 30% to light and dumps 700W+ as heat. The difference is why LED growers often need less aggressive cooling and can sometimes increase ambient temps slightly. For spectrum considerations, check out our article on understanding grow light spectrum.