I've been wanting to build a UV box with tubes, but I got this 400w metal halide light for free. Already blew too much $ on hoarding film anyways. Used, these lights often go unsold because of the shipping expense and it's not something most people mess with. Made some van dyke prints with it the past couple of nights. As shown, 15 minutes is solarized, 10 minutes looks pretty good, 5 minutes is sorta light. Height is adjustable via the strap or empty paint can. I might still build a UV box someday, but I'm pleased with this for now.