Closest i've got to a productive micro grow was a 3 x 2 wardrobe with a 600W HPS in an open reflector That was a very long time ago, i grew a huge cone like a witches hat but i couldn't deal with the heat no matter what i did. I had to throw about 5 oz of it out cos it was rotten in the middle.
That was an eye opener cos my first ever grow was also in a small wardrobe but i bolted two 80W HPS yard flood lights together. I also built a diy flood and drain system for it but i had endless problems with it choking up. I tried again several times over the years, enough to assure me i didn't want anything more to do with active hydro systems.
I'm helping an old friend just now with his own stealth wardrobe grow. I sold him my 250W cob rig for what it cost to me to build it. He decided he needed to build another one before we had even finished the first one