Who has used the HTGsupply 150w HPS?

I posted this thread in a different forum but no one is responding, so hopefully some of you can help me out here..

I built a PC grow box in hopes of keeping a minimimal/stealth grow. I realized that the PC i built was just way to small to flower in. It makes for a really nice veg box though.

So while i veg a few of my friends plants, i want to build a rubbermaid setup with the smaller HTG 150watt HPS fixture. Here is the link http://cgi.ebay.com/150w-HPS-mini-G...1742.m153.l1262

Can someone explain to me the purpose of the ducting on the top of the fixture? Am i supposed to have a fan blowing cool air into the light or sucking hot air out? What if i just mounted a 120mm fan directly on top of it (where the flange goes) and had the air getting sucked out? I plan on mounting this fixture on top of the box and cutting a hole in the top to let the light in.

Also, is that built in ballast able to run an upgraded 150w bulb? Im sure the ebay one isnt the best.

I think ill make a bubbler for the PC veg box and start a SOG in the rubbermaid when i gather more funds for it. Ima lso thinking of adding some blue and red spectrum LEDs to the grow and see if that boosts anything. Maybe not though.

Any input would be awesome from you guys. Thanks for readin!

You can hook up ducting and a fan to cool the light, so you can have it closer. 150w's dont get too hot, but if its in a smaller space then the venting could help alot.

If you're going to use that in a rubbermaid setup, you will definitely need to vent that light. Even though it is only 150 watts, it will produce a decent amount of heat in such a small space. Make sure you have adequate ventilation for the grow space as well. Negative static pressure in this case will be your friend.