900 Watt LED Grow Lights
900W LED grow lights cover a 5x5 footprint at commercial flowering intensity and represent the upper tier of single-fixture efficiency for hobby and professional growers who want maximum output in a five-by-five production zone without stepping up to multi-fixture arrays. FloraFlex, California Lightworks, and Fohse produce the 900W options in this category -- each targeting the 5x5 commercial canopy as the primary coverage zone with high-efficiency Samsung or proprietary diode arrays and 0-10V dimming for controller integration.
900W LED Brands at Hydrobuilder
FloraFlex 900W Full-Spectrum LED is available in 240V and 277V variants, making it appropriate for both hobby room and commercial facility electrical configurations. California Lightworks SpectraMAX Vertical 1000 targets 1000W-equivalent output at lower actual draw. Fohse represents the ultra-premium end of the category -- designed for maximum efficiency and used in top-tier commercial facilities where fixture lifetime and per-umol operating cost are primary purchase criteria. All 900W options offer 0-10V dimming output for integration with TrolMaster, Argus, or other environmental control platforms.
900W vs. 800W for 5x5
At 5x5, the step from 800W to 900W delivers approximately 10-15% additional PPFD at canopy -- meaningful in CO2-enriched high-intensity programs but marginal for ambient-CO2 environments where most varieties are already light-saturated at 800W output. If you are running CO2 supplementation and targeting 1,200+ umol consistently across a 5x5 canopy, 900W provides the headroom. For ambient-CO2 grows, 800W in a 5x5 is more cost-efficient. Browse all LED grow lights or use the Grow Light Calculator. Commercial accounts available.
900 Watt LED Grow Lights FAQ
What canopy does a 900W LED cover?
A 900W LED is optimized for 5x5 foot canopy coverage at high flowering intensity -- typically delivering 900-1,200 umol/m2/s PPFD across the full 5x5 footprint depending on fixture design and hanging height. At 4x4, a 900W LED delivers above-saturation intensity for most ambient-CO2 environments; useful in CO2-enriched rooms but wasteful in standard setups where 800W or less is sufficient. For 6x6 coverage, two 900W fixtures in a tile pattern produce more uniform coverage than a single fixture stretched beyond its optimal footprint.
Is 900W LED appropriate for a 5x5 tent?
Yes -- a 900W LED is well-matched to a 5x5 grow tent for the full flowering cycle. At 900W in a 5x5, you are targeting approximately 900-1,100 umol/m2/s PPFD at canopy level with a quality fixture -- sufficient for demanding flowering varieties in ambient-CO2 conditions and within the productive range for most crops. Ensure your tent ventilation is adequate for the 900W heat load: a 5x5 tent with a 900W fixture requires a 6-inch inline fan with at least 400-450 CFM capacity through a carbon filter. Use our Ventilation Calculator for a precise CFM recommendation for your tent dimensions.
What voltage do 900W LED grow lights require?
FloraFlex 900W LED fixtures are available in 240V and 277V variants. The 277V variant is designed for commercial facilities wired to 277V branch circuits (common in commercial electrical infrastructure). The 240V variant works with standard residential 240V circuits or step-down transformers from 277V. At 900W on a 240V circuit, current draw is approximately 3.75A -- easily managed on a standard 20A 240V circuit with room for additional equipment. Verify your electrical configuration before ordering voltage-specific fixtures.
