corro said:re you talking about Photosynthetically Active Radiation or PAR Watts? The Photosynthetically Active Radiation would be in the same range as natural sunlight. PAR Watts do not apply because it is not electrically powered.
I am wondering about Photosynthetically Active Radiation .. which I would think would be different from just walking outside and taking a reading. I am wondering if there is a loss due to the size of the tubes, the distance the light is traveling down the tube, and the covering on the tube. I also think it would be interesting to see how readings compare to MH bulbs, in the tank itself.
I thought that that was checked about a year ago in this thread but I am not positive.