| LED diodes produce more light per watt than incandescent bulbs; this is useful in lighting that needs to be energy efficient. LEDs can emit light of an intended colour without the use of colour filters that traditional lighting methods require. This is more efficient and can lower initial costs. LEDs can be designed to focus its light through tiny built in lenses. Incandescent and fluorescent sources often require an external reflector to collect light and direct it in a chosen distribution. When LEDs are used in applications where dimming is required, LEDs do not change their colour tint when the current passing through them is lowered - incandescent lamps, which turn yellow. LEDs are ideal for use in applications that are switched on and off frequently, unlike fluorescent lamps that burn out more quickly when cycled frequently, or HID lamps that require a long time before restarting. LEDs have an extremely long life span. Many manufacturers now claim the ETTF (Estimated Time to Failure) for their LEDs to be between 100,000 and 1,000,000 hours |
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