I know vanity sunbed shops are everywhere but these are mainly UVA light and useless for D3 production.
I'm thinking of getting some fluorescent light fittings and reptile 10%+ UVB tubes (E.g. http://www.reptiles.swelluk.com/reptile-supplies/reptile-lighting-415/reptile-uv-bulb-lamps-562/arcadia-d3-reptile-lamp-t5-12-uvb-282650.html) and making my own solution.
Those UVB psoriasis lights are crazily expensive for what they are, so it will be interesting to see how well this works. Summer's finally arrived in the UK so I'm making the most of the real thing for now, this was a random idea bought on while sun bathing :-D
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I would add redlight or incandescent lights. When you get UV from the sun to get vitamin D, the red light component of the sun protects you from the damaging aspect of UV to some degree.
The color temperature of 7500K suggests it has less red than the sun. The lower the color temperature, typically the more red it has.
Let us know how it goes!