Exact same spectrum and phosphor blend as our best selling 4 foot Flower Power, but in a 24", F20 size to fit any situation.

Because these can be powered with a F20 ballast, you can actually push just as much power through this 2 foot tube as we normally do in a 4 foot tube, although you need to make sure you are at least 3 foot away if you power it with 20 watts. 10-12 watts is normal mode for grow tents. 40 watts for industrial grow applications and greenhouse grows.

Usage:
One of these is enough for a 3'x3' to 4'x4' tent. Can be used in open grows, and area covered depends on distance from the canopy. At 3 foot away, you can cover up to a 6'x6' area, although you will need to extend the time run per day to 1.5 to 2 hours. Typical usage is 18"-24" from the canopy, run for up to 60 minutes per day.

Output as measured with a hand held UV meter at 312nm (not the strongest peak for these lamps) 2 foot Flower Power F20 20w, measured dead to lamp: 1450mW/cm2 (normal F20 fixture) 10w, measured dead to lamp: 750mW/cm2 4 foot Flower Power F40 40w, measured dead to lamp: 1400cm2 20w, measured dead to lamp: 800mW/cm2 (normal F32 fixture) Please note that UV output varies radically based on temperature, now long the lamp has been on, how old the lamp is. These are useful for comparing to our other lamps, but no so much for comparing to other lamps. NOTE! Unlike the 4 foot bulbs, these should be used for 60 minutes a day and no more, at a distance of at least 18". The intensity is such that you risk damaging your plants otherwise.