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Incandescent lights utilize tungsten filaments within a vacuum-sealed bulb which give off light when heated to incandescence by electric current. Incandescent lights can be used in applications ranging up to 48V (AC or DC). They do not use ballasted resistors that are required for neon and LED lights; instead individual bulbs are designed for the voltage specified. Incandescent lights can accommodate the full range of lens colors and dispersed light brightness. LED's (Light Emitting Diodes) are composed of a DC diode chip and connections encased in plastic and epoxy. The encasement protects from shock and vibration. A LED light only increases temperature by six degrees above ambient. LED's are available in a wide range of colors and provide focused brightness which is able to match the light intensity of incandescent lights. Neon lights utilize a low-density gas in a sealed glass bulb. With-in the bulb, two electrodes ionizes the inert neon gas and makes it conductive. Once it is ionized, a lower voltage will keep it ionized and keep current flowing through the light.
