I gotta say man they are definitely better than a 400w HPS; Imo they are equal to about 500w of HPS with fantastic light penetration; but most importantly full spectrum. I've sold hundreds of HPS lights and i've sold about 50 LEC lights: My LEC customers always came back blown away by how well the lights performed; I've never had a HPS customer come back and rave about their HPS (obviously they are great lights, but LEC are fantastic lights).
In soil experienced growers will easily crop a pound per LEC 315, in hydro i've seen people crop 1.5 lbs per light. Personally i've gotten over a gram per watt and I've yet to fill out a canopy. The buds are frostier than HPS buds i've seen and grown; and the high is better (if you like sativa-like highs at least).
These lights arent worth hating on for any reason at all; you can throw more lights in a room so your plants get light from more angles than HPS; they are dirt cheap on the electricity bill; and they have light bleached more plants than any light i've ever seen. I've had to move up my LEC lights every time i've grown with them because my plants got way too much light- I've not even had that happen to that extent with HPS.
IMO the only HPS that will out perform LEC315 lights with a proper setup is Double Ended HPS; other than that the LEC315 is king. A properly lit LEC315 room will out yield any properly lit HPS room other than DE. And if you are looking at yield watt per watt; the LEC > HPS all day every day no matter how you look at it.
I'll likely never buy another HPS- the LEC lights are greatly superior.
Thats my 0.02; but that is an enormously researched/experienced 0.02 with both lights.
People wanna grow with HPS? Great; they are great lights go ahead. Looking for something amazing and different? LEC lights are great too.
No reason to hate on people for their light choice. Different spaces call for different lights; people have different preferences, etc... I've had happy customers with HPS and i've had happy customers with LEC and i've had 0 unhappy customers between either light.
One of the huge advantage single LEC lights have is that they are vertically hung; when you look at a LEC reflector instead of a magnum it looks like 5 lights are shining down on you.
This is all the same strain.
LEC buds (630w LEC 5x5 800g yield +100g trim) (closeup pics suck)
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HPS buds (hps 3x3 ~20z yield)
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