2 x DAYLIGHT 30W FLUORESCENT BULB for DIGITAL PHOTOGRAPHY two 30 Watts(each=125Watts incandescent) bulb; 2000 Lumens; daylight 5000K Measured Color Rendering Index (CRI) &gt; 84;Operating Temperature cool ("flicker free"); no color correction needed; Hours of life 8,000 hours Energy Star Compliant, screw into standard sockets Bulb measurements 5.50" length (H), 3.74" diameter (D);Base measurements 2.99" length (B), 1.89" width (A) Certificate UL/CUL/FCC