Go on Amazon, and buy a full spectrum cfl. Just put it in a normal lamp, or jury rig a reflective box with cardboard and flat white paint. Total cost: $30.
I'm not sure that delivers a therapeutic number of lux, which I read in one study was much more important than color temp.
My recommendation is to go to Amazon, buy a 5 meter roll of bright white LED strip and a 6amp power supply (I found a replacement LCD monitor power supply for something like $11 and the LED strip for < $20). Cut the strip into segments and mount to particle board (perhaps with a picture frame in mind), making sure to stagger the position of the LEDs. If your board is non-conductive, you can mount thicker gauge stranded copper wire to either side of the board, and bridge the appropriate pin on the LEDA strip by soldering a short bit of wire to the power channel.
As far as electronics projects go, this one is pretty easy, and 5m of LED strip throws a lot of lux.
They have almost no reds which is the dominant power of the solar spectrum or any other black body. But aiui this discussion is about UV not IR and you can make LEDs with impressive UV output.
