There are lots of different ways to hook this up. The best way is probably to have an inlet duct coming into the light fixture from the outside of the tent, and an outlet duct with an inline pulling air across the sealed light fixture. This way the light is on a completely closed "circuit" and you can vent your heat somewhere else (attic or whatever). You would need an extra inline to pull air through the tent if you did it this way, but it'll be a lot easier to cool.
With a 200 or 400 and a filter, you can hook up the filter inside the tent, duct it to the inlet of the sealed light fixture, then get a good fan to pull air out the other side of the fixture and duct it somewhere you want to vent the heat (unless you're running CO2, then you wouldn't want to be pulling gas out of your tent to cool your light). This is probably the most cost-effective way to do it in your situation.
You're going to want to at least vent the air to another room so you don't have a heat problem in your grow space, but with a 200 (and maybe even a 400), you can probably vent it inside the house and the AC will pick up the slack if venting elsewhere isn't an option. I've temporarily vented a 600w light inside of a house to a different room in the middle of a Texas summer and the AC was able to take care of it. It'll hurt a bit more when the electric bill comes along, but definitely an option.