Think @
Not much valid evidence on the subject and debatable how much it helps. Have done with and without and it seems to taste is a little better and there was a noticeable trichome difference than without. I ran 2 plants each of the same strain and pulled one of each from the tent when UVB was on. Could have been a coincidence since growing from seed...
I think
@CannabisMingus used that bulb. I and a couple of others use the Agromax. I use 2 separate UVA and UVA/UVB bulbs. Sort of follow what
@Mañ'O'Green uses and does. Uva for the last month and UVB for the last two weeks. I do less UVB than him as my light is in a fixed position and much closer than his.
Careful though! You can fry yourself and your plants VERY easily