Compact Fluorescent Grow Lamp Reflectors are highly reflective and for use with E39 mogul base self ballasted compact fluorescent lamps. E26 medium base CFL lamps may be used with an adaptor to accomadate the smaller base. A tempered Glass lens option is available, but not necessary, unless the fixture is in an area when water may come in contact with the bulb. CFL lamps for this reflector are available in 125W, 150W, 200W, and 300W. Do not exceed 300W.