See Light Bulbs in Home and Garden for comparison of types.
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Click on bulbs to the right to search for more information on them.
See size and type designations for nomenclature (A19, BR30, PAR38).

See LED Global Market Penetration of 50% Expected by 2015 |, 2013

Why are LEDs better? Edison bulbs function by making a Tungsten filament very hot, and a hot object glows: radiating energy on a broad spectrum of wavelengths, only a small part of which is visible to the eye. The rest of the radiated energy is mostly heat.

LEDs function by driving electrons across a junction between two semiconductor materials in which electrons move at different energy levels. When the electrons cross the junction, they drop from the higher energy level to the lower one, and the energy each electron loses when it drops takes the form of light to a large extent. The color of the light is mathematically determined by the energy level difference. So all of the light produced by an LED is the same color, and LEDs can be designed to produce light in the visible range. This precise conversion to one color is why LEDs are referred to as "digital light". There is some waste heat caused by inefficiencies within the LED, however, the net result is a big gain in the percentage of electricity converted to visible light.

A 65 watt (W) Incandescent bulb produces about 800 lumens (lm). If you had perfect conversion of electricity into light, you would need only 1.0 Watt ("W") of electrical power to produce 700 lumens (lm).
So a LED bulb (13 W/ 730 lm) is 8% efficient vs. 1.6% efficiency for incandescent bulbs.

Source: LED Light Bulbs Mature At Last - Forbes Dec. 2012

See also Beware - LED bulb reliability |

In 2013 LEDs were 60 watts or less, but new 1,600 lumen (100-watt incandescent equivalent) are available now, but more expensive

Common LED colors include amber, red, green, and blue. There is actually no such thing as a “white” LED. To get white light the kind we use for lighting our homes and offices, different color LEDs are mixed or covered with a phosphor material that converts the color of the light.

LEDs come in a cooler white light at 3,000 Kelvin or a warmer, yellow light at 2,700 Kelvin, which is more like an incandescent. One feature of LEDs is that the light can be adjusted to the full spectrum of colors, which opens up some new possibilities. Philips is selling a lighting kit of four bulbs, controllable through a smart phone, where people can choose the color of light from a full palette.
Source: How to Choose an LED Light Bulb | MIT Technology Review Mar, 2013
See lighting

The usual measure of an LED lamp's economic life is its L70-the time taken for the brightness to fall to 70% of its original value.

LED Garage Bulb | Synergy Lighting


Size shape and base screw type designation
How to Choose an LED Light Bulb | MIT Technology Review Mar, 2013
All About LEDs | Home Depot
LED Lamps Education | LED Lamp Basics | LED Lighting
Five things to consider before buying LED bulbs | How To - CNET
Analysts see LED market hitting peak within three years |
Beware - LED bulb reliability |
The Dark Side of LED Lightbulbs: Scientific American
A tale of two tests: why Energy Star LED light bulbs are a rare breed
Learn About LEDs : ENERGY STAR
Other pages here:
Light Bulbs in Home and Garden
Compact Fluorescent Bulbs
Where to get them: Online Shopping for LED Lighting Products
Ge 2.8w 120v Globe G25 White 2900k LED Light Bulb - 78824 for $15.35
Buy LED Lights Online |
Philips Hue Connected Bulb - Starter Pack - Apple Store (U.S.)
LED lights | eBay
Led Light Bulb Products | Capitol Lighting
Cree, Inc.
items in China LED Light Factory store on eBay!
The false economy of in home LED lighting |

last updated 14 Nov 2013