Different emergency lights use different types of bulbs. Depending on the intended environment, there may be a better choice for the particular lighting solution.
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FLUORESCENT LAMP HEADS
Fluorescent lamps use electricity to excite mercury vapor, producing short-wave ultraviolet light that causes phosphor to fluoresce (hence the name), creating visible light. This style of lighting is commonly used in schools because it can be fit into tubes and installed along ceilings. They are also common in various types of large businesses because they save money through their energy efficient operation and tax incentives in states like California. Over the last several years fluorescent lights have begun to phase out incandescent lights. Emergency lights that utilize fluorescent lamps are available as both AC/emergency and AC only fixtures. This means that the same fixture can be used for both normal and emergency operation.
HALOGEN LAMP HEADS
Halogen bulbs are a type of incandescent lamp that contain a small amount halogen gas and a tungsten filament. This creates a chemical reaction called a halogen cycle that produces light with a higher luminous efficacy and color temperature. Halogen lamps have a variety of uses including automotive, architectural, stage lighting, and home use. This type of lamp head is commonly used in wet location emergency lights because the bright light is able to pierce rain and other elements that would block the field of vision. These lamps are sealed using a fully gasketed design that locks out moisture.
LED LAMP HEADS
Light Emitting Diodes (LED) are a semiconductor light source that combine electrons with electron holes when switched on. This process is called electroluminescence. LEDs have become an increasingly popular choice in recent years as they have become more affordable. This rise in popularity is primarily attributed to their size, brightness, and longevity. They also consume less than 5 watts of electricity at all times, making them an energy efficient option as well. LEDs are popular in fixtures like the cold weather LED emergency light because of their small physical size and energy requirements that allow them to use a more compact nickel-cadmium (Ni-Cd) battery.