PhotonTek SQ300W Pro LED Grow Light 310W | 816 µmol/s, 2.7 µmol/J

PhotonTek SQ300W Pro LED: 816 µmol/s Over a 3x3 Canopy

The number that matters here is 816 µmol/s from 310W, a rated fixture efficacy of 2.7 µmol/J. PhotonTek sets the footprint at up to 3.3 x 3.3 ft, which is a 3x3 tent with a little spill onto the walls. The array carries 576 white diodes at 4000K, plus 24 deep red at 660nm and 24 far red at 730nm. That 4000K base is a full-cycle white, strong enough for tight veg, with the reds pushing flower. One independent PAR test hung it at 17.5 in and read about 1,000 µmol/m² at center. The same grid averaged roughly 765 µmol/m², with corners closer to 600. That test also read a wall draw of 313W, which lines up with the rating. The square frame measures 22.08 x 22.08 x 2.82 in and weighs 11.46 lbs. Heat load runs about 1,051 BTU/h, and current is 2.72A at 120V. Diodes carry a 60,000-hour rating under an IP65 clear-glue coat.

Hanging a 3x3 Grow Light Without a Fan Overhead

There is no fan in this fixture, only a finned heat sink behind the bars. That makes it the quiet choice for a spare-room tent, and it removes the part most likely to fail first. Start high in early veg, then bring it down toward that tested hang height once the canopy fills in. The corners always run softer than the middle, so rotate pots or train the outer plants a little taller. The included dimmer steps through off, a quarter, half, three-quarters and full. Growers who want smooth ramps and sunrise timing move to the P-Tek Digital Controller or a 0–10V room controller. One honest limit shows up in that same meter test. Measured PAR efficacy came in under the rated figure once the far-red share was separated out. It is still a strong result for a passive square fixture, but budget on the meter reading rather than the box. Two of these side by side cover a 3x6, with the seam between them reading brighter than the outer edges.

Key Features

• 816 µmol/s at 2.7 µmol/J: Enough output for a full 3x3 flowering canopy from a single 310W fixture.
• 4000K + 660nm + 730nm Diodes: A full-cycle white base with deep red and far red to push flower and stretch control.
• Fanless Heat Sink: Silent operation and no fan motor to replace, which suits bedroom and spare-room tents.
• Square 22 in Frame: Fits inside a 3x3 tent with clearance for ducting and keeps center-to-corner readings close.
• IP65 Clear-Glue Coating: Seals the bars against humidity and spray while passing about 99% of the light.
• Stepped 0-10V Dimmer Included: Off, 25, 50, 75 and 100% settings cover seedlings through late bloom without extra gear.
• Controller Ready: Accepts the P-Tek Digital Controller or universal 0-10V controllers for scheduled ramps.

Technical Specifications