Stoke
- 45
- 18
In Ed Rosenthal's book he mentions giving your plants UVB in the last 2 weeks of flowering to increase THC production. My grow room is 5 x 5 x 8, and I'm using 1 1000w HPS bulb with a Lumatek digital ballast, and the bulb/reflector is closed loop air cooled.
So according to Rosenthal, my problem is that HPS bulbs don't provide UVB. I could switch to a 1000w MH bulb to get some UVB, but he also mentions using tanning lamps, or those CFL's used in lizard cages. The great thing about the MH bulb is I can use them with no problems with my ballast.
In addition, the biggest issue is the glass on the bottom of the reflector. That glass blocks UVB (and diminishes other light in the spectrum). However, according to him, removing the glass on the reflector shouldn't make cooling the light any less effective; my air cooled system should still work effectively.
So what is everyone's thoughts? Would replacing my HPS bulb with an MH bulb in the final weeks of flowering be sufficient enough? Or do I need additional sources of UVB? Do you agree that I should take off the glass on the bottom of my reflector? Anyone with a difference of opinion?
Thanks for any feedback! Feel free to recommend an MH bulb for me to use with my ballast, or any other recommendations you feel would work best for my setup.
So according to Rosenthal, my problem is that HPS bulbs don't provide UVB. I could switch to a 1000w MH bulb to get some UVB, but he also mentions using tanning lamps, or those CFL's used in lizard cages. The great thing about the MH bulb is I can use them with no problems with my ballast.
In addition, the biggest issue is the glass on the bottom of the reflector. That glass blocks UVB (and diminishes other light in the spectrum). However, according to him, removing the glass on the reflector shouldn't make cooling the light any less effective; my air cooled system should still work effectively.
So what is everyone's thoughts? Would replacing my HPS bulb with an MH bulb in the final weeks of flowering be sufficient enough? Or do I need additional sources of UVB? Do you agree that I should take off the glass on the bottom of my reflector? Anyone with a difference of opinion?
Thanks for any feedback! Feel free to recommend an MH bulb for me to use with my ballast, or any other recommendations you feel would work best for my setup.