Best NB UVB lamp for home for vitiligo.

I have vitiligo from last 9 years. Consulted different specialists and have taken almost all medication which has very less impact. Phototherapy is the only thing that worked perfectly however with the lifestyle I have, going to hospital 3 times in a week has become difficult . Could you please help me with a good NV UVB phototherapy machine/lamp to buy so that I can continue this treatment at home. Also, if someone can help me with the jules count or whatever pattern the lamp works with to adjust the light for phototherapy. I am impacted with this starting below my waist area till my calves . Please let me know something where tubes can cover front and back body completely. Would prefer something with tubes rather than those hand held lamps . Thanks