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Steel Red Letter Green Letter Nickel–Metal Hydride (NiMH) Ceiling Mount Exit Signs
Exit Signs
![Image of Red LED UL Listed exit sign](/images/nowatermark/0110LEEDRXZEI-FAP.jpg)
Steel
Steel Exit SignsRed Letter
New York City and Chicago require exit signs to have red lettersCeiling Mount
Ceiling MountGreen Letter
Green Letter Exit SignsNickel–Metal Hydride (NiMH)
NiMH batteries can have two to three times the capacity of an equivalent size NiCd, and their energy density approaches that of a lithium-ion cell. Nickel–Metal Hydride batteries are good for high current drain applications because of their low internal resistance.
The disadvantage of NiMH batteries is their high rate of self-discharge. NiMH batteries typically lose 4% of their charge per day of storage. LSD NiMH batteries significantly lower self-discharge, but at the cost of lowering capacity by about 20%.