One lighting fan, or two?

[FlyingFish65]

I just purchased a locally owned, used Hamilton 250Wx2 MH, 110Wx2 VHO with Magnetic Ballasts (used for 9 months, $300...maybe paid too much?). The pendant has one fan only (it was noisy, but I cleaned it well and sounds better now). The seller said he "researched it online" and learned that "with two fans [one at each end] they 'fight' it out... so you are better with one." I'm setting my tank up in a cool basement, and let it run most of the day yesterday... it didn't seem too hot. Any thoughts????

It's noisy enough with just one fan.

 

[Scuba_Steve]

one fan for intake, one for exaust is the best way. dont put the so they are both blowing in or out. also use the same type of fan so their output will be about the same

 

[Clayman]

Same here one fan on each end of the canopy one pushing and one pulling. To do this the fans must be the same type so that they are close to each other in performance.

 

[sidjam]

if your water temp. is ok with one i wouldn't worry about getting another.