You guys think Ill have temp issues??

I got a Grand wardrobe box with mylar, 1x120mm fan exhaust and 6inch fan circulation
veg with CFL's not a heat issue around 73 in box but for flowering going to use a 150watt Self Ballasted HPS

what you guys think?

Anything over 80f is pushing it, perfect would be about 75f. Pays to get an accurate, digital thermometer.