Quick lighting question about VHO's

[cschweitzer]

I'm setting up a couple all VHO fixtures. My ballasts are going to be external from the fixture, only bulbs and reflector(obviously endcaps and wires) will be in the box. The question is, being so low heat production from VHO bulbs, do I need to add fans to the lighting box?

One setup is a 3X95W 36" and the other is a 4X110W 48".

Thanks,
Craig