Heat Issue

I have a 2x2x4 cabinet flowering 1 plant about 20" tall (3 weeks in)
I am having a problem with heat, with the lights on it is hitting 98 degrees inside, I have a 250w HPS and 4 45w cfls and a 70 hps inside. I am venting with a 80cfm fan that I have on 24/7 in the top of the cabinet intake is in the bottom of the cab. Any Advise? BTW the 250w HPS is mounted outside the Cabinet and I have glass seperating the light and the plant, I got the idea off Videoman's box Idea.

Put some more fans in maybe?

Thats a lot of light for one plant. I hope you made the top removable and can add height extensions, four feet ain't gonna do it. You will probably need to air-cool that enclosed light. I saw a couple of posts that said Wally world has a 4" all metal fan for like$5.00. You may want to check those out, I know I'm going to. VV

i had haet probelm and added a second computer fan blowing air out of the box, works great.