MH light question

[spider8u]

Hi right now i run T5 set up with 8 t5 bulbs but was thinking about going with MH set up.I would just be running 2x150 watts over 80 gl tank what i would like to know is how much would 2x150 lights heat up my tank thx

[nanojg]

A little less than 8 x 39 T5's.

312 v. 300 watts (the 300 may vary depending on the bulb and ballast)