NEMA wattage labels are standardized labels defined by the National Electrical Manufacturers Association (NEMA) used on street lighting fixtures to indicate the wattage of the lamp for maintenance purposes.
Additionally, various colors are used to identify what type of lamp the fixture uses.
A blue sticker indicates the lamp is mercury vapor (MV).
A sticker that is half-red and half-white indicates a pulse start metal halide lamp (PSMH).
A label with a PS before the MH (e.g. 17 PSMH) on a MH sticker indicates that the fixture utilizes the newer pulse start technology, which uses different lamps than the older probe start technology.