Here is a picture of the bulb I purchased. I got them off of eBay. They were around $12.97 each plus shipping if memory serves me right. Hope this helps.
Below is the description I copied directly from the ad.
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Our Popular 30 Watts high-output daylight balanced compact fluorescent (CFL) bulbs are ideal for product photography. It fits most standard Photo fixtures.
Specifications:
Watts (energy consumption) 30 Watts=125Watts incandescent bulb
Lumens (measured brightness) 2000 Lumens
Measured Color Temperature daylight 5000K
Measured Color Rendering Index (CRI) > 84
Operating Temperature cool ("flicker free")
Need color correction? No
Hours of life 10,000 hours
Standard Energy Star Compliant, screw into standard sockets
Bulb measurements 5.50" length (L), 3.74" diameter (D)
Base measurements 2.99" length (H), 1.89" width (W)
Certificate UL/CUL/FCC