Biggest Light for my tent

I just bought a 4x4 tent and a 1000 watter to go with it. I also have a closet tent that cureently has a 250 watt light in it. What is the smallest tens someone has ran a 600 in? I want to upgrade to either a 400 or 600 for the little tent. What should I get? How much hotter is a 600 than a 400?

there is a big heat differance between the two.

There is a heat difference but if you use an aircooled hood it shouldn't matter. The 600 will more than make up for it in lumens, my lumatek lamp puts out 93,000 initial lumens.