The packaging and bulbs shown below are for the No 2 and No 2B bulbs offered by Sylvania and Wabash. The “B” after the numeral stands for “blue” which gives off a blue tinted light that is the proper color temperature for exposing color film. Finally, a comparison shot between the No 2B, the 3B, and a regular frosted light bulb to give a sense of size of these mighty big bulbs.
