Mh And No Chiller

[The Hawk'ster]

I am putting in 2 MH 250w 10k along with 2 VHO 48" 110w. The MH are 10" off the the water and the VHO are 6" off the water. I am putting 2 4" fans blowing into the canapy from the center on each side. I have a 90g tank with 4 110w VHO that are 4" off the water and the temp is steady @ 78.5f with one 4" fan. I currently go through about 8gals of evaporated water a wk. How much evaporated water a wk will I go through and will the temp of the tank rise cosiderably with this new set up?

[Nek]

Do you have AC in the house?? If you do the setup wont be a prob. I run 2 250's (about 4" from h2o) and 2 110W VHO on a 72 with 1 fan---no problems. Evaporation WILL increase, which is a good thing, but by how much, Im not sure.

[alf3482]

I run a 120 gal with 2x400mh and 2x 55 w Pc with no chillier. temp has never went over 82.5.