About LED Bulb

An LED lamp is a light-emitting diode (LED)product that is assembled into a lamp (or light
bulb ) for use in lighting fixtures. LED lamps have a lifespan and electrical efficiency that is several times better than incandescent lamps , and significantly better than most fluorescent lamps , with some chips able to emit more than 100 lumens per watt. The LED lamp market is
projected to grow by more than twelve-fold over the next decade, from $2 billion in the beginning of 2014 to $25 billion in 2023, a
compound annual growth rate (CAGR) of 25%.
[1] Like incandescent lamps and unlike most fluorescent lamps (e.g. tubes and compact fluorescent lamps or CFLs), LEDs come to full
brightness without need for a warm-up time; the life of fluorescent lighting is also reduced by
frequent switching on and off. [ citation needed ] Initial cost of LED is usually higher. Degradation
of LED dye and packaging materials reduces light output to some extent over time. Some LED lamps are made to be a directly compatible drop-in replacement for
incandescent or fluorescent lamps. An LED lamp packaging may show the lumen output, power consumption in watts, color temperature in kelvins or description (e.g. "warm white"), operating temperature range, and sometimes
the equivalent wattage of an incandescent lamp of similar luminous output. LEDs do not emit light in all directions, and their
directional characteristics affect the design of lamps. The light output of single LEDs is less than that of incandescent and compact fluorescent lamps; in most applications multiple LEDs are used to form a lamp, although high-
power versions (see below) are becoming available.
LED chips need controlled direct current (DC) electrical power; an appropriate circuit is required to convert alternating curent from thesupply to the regulated low voltage direct current used by the LEDs. LEDs are adversely affected by high temperature, so LED lamps
typically include heat dissipation elements such as heat sinks and cooling fins . http://en.m.wikipedia.org/wiki/LED_lamp