There is a 12" x 2" hole in the back of the cabinet towards the top, there is a fan in there that is circulating air upwards, so hot air goes out the hole.

I'm also doing some ghetto CO2 enrichment with eggshells and vinegar in a bottle with a tube feeding into the fan.

I'll show pics of the setup later. I'm just curious how long (weeks, months days) people typically veg for. and what the growth rate is once flowering begins.

Cabinet is 26" x 26" x 16" with only one plant and four CFLS totaling 220 watts. One of the CFLs is like 6200k 40 watt and the rest are 60 watt I don't know what K they are but they are bright ass yellow.