Relax guys. No need for personal attacks.
What is the cost of the 75w version? My thought is this they are 75w stated 43-53% efficient so say 50% that's 37.5 par watts. When comparing to a mars 300 160 x .2 and a far less complete spectrum you get 32 par watts. So it's giving the plants a little more photons than what people consider to be a 300w equivalent. It's a quality light from what I can see but if the price is over 300 dollars I'd say it's over priced for what you get.
What is the cost of the 75w version? My thought is this they are 75w stated 43-53% efficient so say 50% that's 37.5 par watts. When comparing to a mars 300 160 x .2 and a far less complete spectrum you get 32 par watts. So it's giving the plants a little more photons than what people consider to be a 300w equivalent. It's a quality light from what I can see but if the price is over 300 dollars I'd say it's over priced for what you get.