PBL Full Spectrum Photography Video Flourescent Light Bulbs, New Improved Bulb 50 Watt CFL 5500k Natural Daylight Balanced Pure White Case Four (4) PBL 50 watt new fluorescent bulbs equivalent to 250 watts each 2800 lumens, 5500k daylight, CRI 87+, bulb life 8,000+ hours Produces natural skintones, with out any filtration 90% less heat than incandescent lighting, 120volts Perfect for treatment of S.A.D. - winter blues