lot of four matching vintage industrial new old stock cobalt blue glass photoflood light bulbs fabricated by the general electric lamp co., lamp department and ohio lamp works, oh. the 110 volt, 1500 watt mogul base light bulbs were found with original packaging (one carton is shown in the image) at an old electric supply company located in detroit. the bulbs are used as a type of studio lighting with a color temperature resembling natural daylight. priced for the lot. each bulb measures 12 inches in height.