Best LED Grow Lights for Small Cannabis Grow: A Comparison Review
Discover the top LED grow lights for small cannabis grows in this comprehensive comparison review, perfect for indoor cultivation.
Best LED Grow Lights for Cannabis 2024
Three specs decide a cannabis light: efficacy in µmol/J, photon flux (PPF) in µmol/s, and the PPFD the fixture puts across a stated footprint. In 2024, bar and quantum board fixtures from HLG, Fluence, Mars Hydro and Spider Farmer run 2.6 to 3.1 µmol/J. Blurple panels from 2018 run 1.2 to 1.6 µmol/J and draw more watts for the same photons.
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Top pick: HLG Scorpion Diablo
HLG rates the Scorpion Diablo near 2.9 µmol/J at 650 W, with PPF close to 1885 µmol/s. The board uses Samsung and Osram diodes plus a Mean Well driver with dimming. HLG lists a 5x5 ft veg footprint and a 4x4 ft flower footprint. Check the vendor for the current price, since HLG changes bundles and board versions through the year.
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Value pick for 4x4 and 5x5: Spider Farmer SE7000
The SE7000 draws 730 W and lists 2044 µmol/s PPF at 2.8 µmol/J. Bars spread diodes across the frame, which cuts hot spots in the center. It covers a 4x4 ft flower area at the recommended hang height. Dimming and daisy chain control are included.
Cheap LED Grow Lights for Cannabis That Work: Buying Guide
Small tents: Mars Hydro FC-E3000
300 W, about 2.8 µmol/J, PPF near 840 µmol/s. It fits a 2.5x2.5 ft flower footprint and a 3x3 ft veg footprint per the Mars Hydro spec sheet. The driver comes off the frame, so you can mount it outside the tent to move heat out of the canopy.
Commercial rooms: Fluence SPYDR 2i
660 W at about 2.6 µmol/J and 1700 µmol/s PPF. Fluence publishes PPF maps for single fixtures and for rows of fixtures, which helps when you plan a room. Fluence sells through distributors, not direct.
What to check before you buy
- DLI: flowering cannabis at 12/12 needs 30 to 40 mol/m²/day. That equals 694 to 925 µmol/m²/s average PPFD.
- Veg at 18/6: 20 to 30 mol/m²/day, which is 300 to 460 µmol/m²/s.
- Coverage: use the PPFD map, not the wattage. A 4x4 ft flower footprint needs even numbers at the corners, not just under the center.
- Driver: Mean Well and Sosen drivers are common and replaceable.
- Certification: UL or ETL listing matters for commercial insurance and inspections.
- Power: 650 W at 12 hours draws 7.8 kWh per day. At $0.15 per kWh that is $1.17 per day.
Rooms with CO2 at 1200 to 1500 ppm can run 900 to 1000 µmol/m²/s. Without CO2, readings above 900 µmol/m²/s can cause bleaching and leaf stress.
One unknown: brands publish PPFD maps at different heights and grid sizes, so cross brand numbers do not match exactly. Ask the seller for the map at the height you will hang the light.