Bright Sunlight Provides Irradiance = to 1KW. Brakes down to:
527 watts of IR
445 watts of Visible light
32 watts of UV (longer wave, lower frequency)
I have always assumed that 1000 watt HID is the perfect grow light..all things considered...

and adjust my duel 400 watt lights; accordingly.
Dutch Pimp Reviewed by Dutch Pimp on . UVb an experiment Quick background: I have been using UVb supplemental lighting for many years now and have always thought it added to the finished product in a couple of ways. I had never promoted it's use on these boards because I felt it was dangerous and had real potential to harm people. That changed a few months back on the other UVb thread, and I came out of the closet in strong support of it's use. Well some here who's opinion I respect (like Weezard) held the opposite view and those discussions led me Rating: 5