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Way more than 21sq, you don't know how they work,unless you use them...
I understand where you are coming from, but that reflector is not designed for the 21' sq footprint. it is designed to be 36" from the tops, and because of this it focuses the beam mostly straight down, which is why they are boasting better numbers than others setups. But in reality, that might give it a 10 or so square foot coverage.
I'm not trying to knock your setup, i'm sure you spent plenty of time and work setting it up, and you are obviously seeing gains over SE HPS, which is not surprising. You are right, I dont know exactly how well it works without trying it, I can only guess based on the information available about this product. I have studied this product for almost as long as the CMH, and in this case I'm not really intersted in finding out for myself, exactly how well it performs, because the design is not only inferior, it goes directly against how the lamp is meant to be used. Plus the price is outrageous, and any time you use glass, you are losing performance, period.
The fan cooling that hood, should be bringing in more fresh air, which actually gives you better cooling than cooled hoods, I have tested this. I have used cooled hoods, and since I took the fans off those, and set them up to move more air in and out of the room. running only bare bulbs, my temps are lower than ever. Plus you get more fresh air, which means more CO2, and more plant growth.
Again, you have more than enough cooling to use open focal point reflectors, and regardless if the cooled hood allows the bulb to burn at proper heat, you still have glass in front, which blocks light, degrades spectrum, and blocks out most of the UV this bulb has. On top of that, the $300 cooled hood, $100+ fan, speed contoller/ducting/reducers, etc, etc, you could have easily bought a second light, and then you would have proper coverage at 1000umol/meter squared of uniform light, since you are obviously covering more than 21 sq ft, which is the max this lamp is rated for, and only when used in the manner it was designed for, in an open focal point reflector, which is more efficient than any other reflector available, and there are several reasons for this. One is, that it traps the heat around the bulb, due to its small size, keeping the operating temp at optimum, so the ballast doesnt have to try and compensate, overdriving the bulb to get proper temp. As far as light spreading eficiency it can't be beat. It works in the same way as the new Andasol I, II, and III solar power stations in Spain, but in the inverse. These power plants are simply made up of a long mirror trough, which is essentially an upside down focal point reflector, with a long boiler tube at the focal point, instead of a DE bulb. Think magnifying glass buring ants... same concept. There is more desert on this planet than anything besides ocean, so anyone who thinks solar power is inferior to fossil fuels/nuclear energy, needs to do some research.
These solar plants produce around the same output as a single reactor nuclear plant, which is why I brought it up to explain the superiority of focal point reflectors. They are very different from any other type of reflector. Dont let the small size fool you, it is to your advantage, and spreads light far more efficiently than that huge heavy awkward expensive cooled hood, or any other reflector hood, which does a lot more shading, than reflecting.
