If anyone ends up building lamps for themselves or buys something for self-treatment, you should look up protocols for use to treat psoriasis. Psoriasis is often treated with full-body UVB lamps like these units: https://www.natbiocorp.com/?gclid=Cj0KCQjwreT8BRDTARIsAJLI0K...

Protocols typically start out with just 30-45 seconds, and increase from there to a max of 5-7 minutes in front of the lamps. A lot depends however on the type of skin you have, which you should figure out before starting any of this. Even though it's UVB and not UVA like at tanning salons, you can still burn yourself very badly.