UV Supplements - When, how long and what types?

Scottxb73

Well-Known Member
Ok let's talk UV
So some say right through the grow as it resembles reality better but not to much as it stunts the bulk..
Some say the last 1-3 weeks at the end.
Some say UVA from certain types of LED is useless, and also say UVB is great for providing for resins.
I went with the CMH type 10000k UV lamp as a alternative to the hps so eg HPS 11 hours in week 8 and CMH UV 1 hour and the end of the daly cycle..
Thease are full spectrum with heaps of UV and apparently they have UVA and UVB rays so it is probably the best option I guess.
I see many types but assuming this has the best output. Pictured is my cool tube with its CMH buddy, this will use the hps reflector as well once it's active, so not perfect but works good and easy and cheap apart from the UV lamp 😎

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