Step 1: What You Need...
1. 2 clean milk crates, or something along that line...basically cubes with holes in them to emit light and air. I have one that I use that is a metal mesh cube that I bought at BedBath&Beyond.
2. 1 work light with a metal "cage" surrounding the light socket, with or without a clip...they're inexpensive and can take the higher wattages...the cage keeps the bulb from hitting whatever kind of "cube" you're using...no fire or melting plastic that way.
3. Light bulbs. duh. I find a 150 watt GE standard incandescent bulb is pretty efficient for drying things.. Then between dryings, to be "green" &/or frugal, you can use a cooler burning cfl or something like a 60 watt incandescent, if you're using it to help keep the air dry in the closet. Even these last longer than the 150's, and are much cheaper.
4. a piece of wood or something heat and moisture resistant to sandwich between the two cubes...I found a nice slat of wood in an alley, and painted it with acryllic paints, and then went over it with floor wax...to make it more water proof. The size of the wood is up to you and the space you have to fill... i try to keep any moisture from coming into contact with the things I store around the light box.
5. something to drape over the open face of the cube to diffract the light---this moves the light box into the genre of aesthetical indirect lighting...for awhile i used a sheet of mylar for the box, and used it to display some small sculptures inside...lately, i've been using a swatch of red vinyl cut-to-fit, which looks sort of like my crummy drawing...a hand towel also casts a nice subdued light , and you can also dry the towel out that way...obviously you need to take care not to let any fabric touch the bulb...
DRYING TIP: It is always a good idea to make sure whatever it is you are drying is not too sodden, and dripping ...if you're drying fabrics, what you can do to speed up the process is to roll whatever it is you are drying in a dry towel, and squeeze out the excess moisture beforehand...You really don't want any water dripping into your light source.
Step 2: Voila!
Please excuse my crude drawings...my camera is in hock.