The Iwasakis are very bright and "white" - add the actinic from the T5s and it is awesome. I was very impressed with the output and growth of corals.
The heat was never an issue for me. I went with the 175W for that reason (and energy savings). The PAR values for the 175W iwasakis are amazing. The MH reflectors are super efficient and very much worth the total cost alone.
let me know if you want some pics of them turned on and running.
the tank is gone now but I can fire it up and show you.
---------- Post added 11-30-2016 at 03:10 PM ----------
some more pics of the first light unit