Thats a good bulb if its' within 12" of the surface. After that you lose ALOT of the UV's. At 12" your only getting 50% of the UV out put to the ground.
Thats a good bulb if its' within 12" of the surface. After that you lose ALOT of the UV's. At 12" your only getting 50% of the UV out put to the ground.