Lol!
Had a hard time watching his vid, lol! He maybe should not smoke before..
Unfortunately most of the bulbs he bought are completely useless. All these black lights for instance have the highest output in the 400-410nm range, so there is maybe a bit of UVA but for sure no UVB.
The only one is the Reptiglow bulb but with only 14w and a 5% UVB bulbs it would be enough for 1sft or so. He should have used the latest T5 bulbs with at least 10, 12 or 14% UVB(Arcadia, Reptisun, JBL, ...). In the last minute someone mentioned the Agromax bulbs but yea, right before the vid finished, lol!
I agree, there is a lot of bro sience in these area but most peeps do not understand how to harden the plants off to UVB. Its like full sunlight and the plants not used to it need a few days in a shaded area to get used to it.
Yes, the energy used will not be used for new growth/photosyntesis cuz there is only a little light in the PAR range and when you add it you will loose some over all efficiency. But with the Agromax or Flowerpower bulbs you can shorten their usage to 2-4h the day because they are 3-5 times stronger. So the additional energy costs are not soooo high in the end.
I've not done direct comparisions with and without UVB but I have used the same strain with and without UVB and UVB weed was/still is for sure different and a lot stronger. I have made blind tests with my buddies and 4 of 5 find the UVB weed much better, me included. And I'll never look back!
I've currently a grow going on with 325w of F-strips above 9sft and I have 48w of Agromax PureUV running 3h the day(2x 1,5h). Distance is ~24" now and they have fully adapt to it and look super healthy. Below are a few shots from the last week..
He should visit the websites from the Agromax and Flowerpower bulbs to get a better idea of how it works. There are also user reviews and pdf's available. On youtube there are only different output tests of the Agromax PureUV bulbs available as far as I know but to be honest, I have not searched for more than that.