1st time cardboard growbox ... Need some tips!

Hello all, this is my 1st attempt to grow inside a cardboard box and appreciate any pointers you have. Im using one 21 x 18 x 46 wardrobe moving box with a smaller moving box inside to get my seedling close to the light. I also have a second box same dimensions that I was thinking about attaching to expand my grow area for more plants and I also have a small closet that may be used further on down. I needed something quick and cheap because I germinated to early before I had a good setup so I used what I had to start. My light is not very good right now I'm using one 100 watt philips bulb and a white plastic reflector. I plan on buying multiple higher wattage cfl's later this week when I get some cash flow. I was also debating on using a 150 watt hps or mh but was concerning the heat in the box. Would this be an issue? Should I maybe just use an HID for my closet? How long would the light im using right now be suitable? For soil I wish I wouldve used something more organic, but for now im using basic MG potting mix. Any good? I also used a solution of 1/5 hydrogen peroxide and 4/5 filtered and distilled water for when I first stuck my germinated seedling in the soil. I cut two small sized holes adjacent from one another for some ventilation and stuck a box fan on one side and covered the hole with thin screening to filter the air a little. I plan on covering one of the holes and putting some exhaust fans at the top sucking the air in threw the vent hole with screening. Any suggestions? I will also put one or two small oscillating fans at the bottom. Another thing I plan on doing later this week is painting the inside white. I've posted some pictures to better explain what im working with and will post more when I improve the box.

two more pictures

HPS will be a heat issue, the CFL's will also create a lot of heat in that small of a space. You can get 4 ft cool white T5 shop lights, I'd recommend four of them one in each corner then get a 150W CFL for the overhead. You can go to dollar tree and pick up reflective window visors for cars for a buck each, they work great for reflecting the light. The light you're using now is not efficient at all. Do you have a window you can set them near for now? My friend once made the exact same set up(years ago) and used the old round 22W flourescents and covered the inside with tin foil, he got about a solid ounce out of a couple of plants.

DO NOT PURCHASE INEXPENSIVE CFL'S, THERE HAVE BEEN MANY REPORTS OF BAD SOLDERING CAUSING THEM TO CATCH FIRE. I suggest GE, at least the article read said they use a better process in assembling them.

I have a outside deck I could use for a little bit until I improve. Thanks

starting fresh new log today