LED Bulb:
Diodes
use direct current (DC) electrical power. To use them from standard AC
power they are operated with internal or external rectifier circuits
that provide a regulated current output at low voltage. LEDs are
degraded or damaged by operating at high temperatures, so LED lamps
typically include heat dissipation elements such as heat sinks and
cooling fins.
- LED Buld AC 150v - 240v (1 watt - 20 watt)
- LED Buld DC 6v,12v, 24v (1 watt - 20 watt)
An
LED lamp (LED light bulb) is a solid-state lamp that uses
light-emitting diodes (LEDs) as the source of light. The LEDs involved
may be conventional semiconductor light-emitting diodes, organic LEDs
(OLED), or polymer light-emitting diodes (PLED) devices. However, PLED
technologies are not commercially available. Diode technology improves
steadily.
LED
lamps can be made interchangeable with other types of lamps. Assemblies
of high power light-emitting diodes can be used to replace incandescent
or fluorescent lamps. Some LED lamps are made with identical bases so
that they are directly interchangeable with incandescent bulbs. Since
the luminous efficacy (amount of visible light produced per unit of
electrical power input) varies widely between LED and incandescent
lamps, lamps are usefully marked with their lumen output to allow
comparison with other types of lamps. LED lamps are sometimes marked to
show the watt rating of an incandescent lamp with approximately the same
lumen output, for consumer reference in purchasing a lamp that will
provide a similar level of illumination.
One
high power LED chip used in LED lights can emit up to 7,500 lumens for
an electrical power consumption of 100 watts. LEDs do not emit light in
all directions, and their directional characteristics affect the design
of lamps. The efficiency of conversion from electric power to light is
generally higher than with incandescent lamps. Since the light output of
many types of light-emitting diodes is small compared to incandescent
and compact fluorescent lamps, in most applications multiple diodes are
assembled.
LED
lamps offer long service life and high energy efficiency, but initial
costs are higher than those of fluorescent and incandescent lamps. Life
cycle of LED lamps is multiple compared to incandescent lamps, however,
degradation of LED chips reduces luminous flux over life cycle as with
conventional lamps.
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