This is a 32 candlepower carbon filament light bulb. It does not have a sticker showing the actual rating, however this size is typical of 32 candlepower. This bulb is a little bit harder to find than the smaller, 16 c.p. carbon light bulbs from the 1900's, which are very common. This particular bulb has platinum lead-in wires (the short shiny wire segments that connect the base to the carbon filament through the stem's glass). This is definitely not the largest carbon light bulb you will find, but it is indeed a larger version of the usual common old 16 c.p. carbon bulbs that are most abundant.