I have a quick question for all the light wiz's dont know if this makes any sense or not but why not ask it you know? If you have a HPS lights which generates more heat means you have to place this light farther from the the plant correct? Now if you have one of these light setup's you can place the lights 3" from the top of the plants. I dont know if lumens disperde pending on the distance it is from the plant but doesnt this light setup have more of an advantage compared to a HPS becasue it has to be farther.

Ex. 400HPS = IDK lets say 50,000 lumens but has to be 12" from the plant
Ex. T5 = IDK lets say 20,000 lumens but can be placed 3" from the plant

now you have twice the amount of lumens but your also 4 times closer to the plants then you would be with the HPS .

p.s. like i said i dont know if this makes any sense but seemed like an interesting question to me so pls let me know thanxz