Hi Madhu.
I am a Canadain but have travelled and have lived in Indian sub-Continent. My question is why are you looking for NB-UVB when the best light you can have is natural sunlight to treat VIT? When I was in Bangal I had VIT attack on my hands. I was given Meladenine (Suspect Spelling) and was told to sit in the sun for 20 minutes after applying the ointment. Believe me it took less than a month to get rid of VIT on my hand eventhough I ended up burning my hands slightly where I had applied ointment.
To be honest I get best results from treatment in the summer whan I am able to expose my spots to natural sun. We are lucky if we get a month of warm weather where I am.
Good Luck.
