Just finished making this light box to relic nitro finishes on guitar bodys. The 2 fluorescent tube are specialized to output UVB light at 313nm - this is the band of light that ages nitrocellulose to that nice vintage amber. Its my first try at this technique but from all my research its the way to go - much more authentic than applying a slight amber tint over existing finishes.
The guitar will be featured in a long post I am putting together detailing the relicing process. I am keeping a few secrets to myself though.