Some of the most well known and highly rated energy efficient light bulbs are made by NanoLight, EcoSmart, Philips, and Chevron. These can be found at any local Home Depot.
No, the most energy efficient bulbs are LED (Light Emitting Diode) light bulbs.
Compact fluorescent light bulbs are pretty energy efficient and are energy star rated.
Energy efficient incandescent light bulbs can be purchased from most lighting stores and major supermarkets. They can also be purchased online at places like Home Depot, Amazon and Earth Easy.
Light bulbs in order of the least to most energy efficient : incandescent, halogen, fluorescent, LED. For home owners, most reasonable is the CFL lightbulb, which is cheaper and longer lasting than the LED.
The type of light bulbs that waste the most energy are incandescent bulbs. They are least efficient because around 90% of the energy is lost on heat. They are also the shortest-lived light bulbs. The most efficient lights are LED lights, followed by CFLs, followed by the new Halogen incandescent bulbs. See the related link below for more information.
LED bulbs, or Light Emitting Diode bulbs are far more efficient at turning energy into light than fluorescent bulbs. They are the most energy efficient bulbs available today and last much longer than any other bulbs. Although very expensive, the price is expected to come down over time.
Fluorescant light bulbs are much more efficient than incandescant, (lasting up to 7 years) and provide more light as well. They can save you hundreds of dollars on energy per year, depending on the number you replace.
The most energy efficient lighing is florescent lighting; it takes less power and energy to turn on. CFL lightbulbs are also very energy efficient and would save a lot of money. They will have an energy saver sign on the box if you are not sure. A fixture that has an energy star approved logo on the item would be the most efficient and use the least amount of energy possible. Also using energy efficient light bulbs will improve the efficiency.
They do use about a quarter of the energy as normal bulbs.
A Low energy bulbs uses about 1/5 energy of a traditional bulb. ie. 20w (Low energy bulb) = 100w (standard filiment bulb) 80%+ traditional bulb s' energy is lost as heat. The 20% figure shown above only relates to the low energy bulb during its normal usage. The question was about the overall ecological balance, which includes ecological burden through manufacture, distribution and disposal (or recycling). Low energy light bulbs contain heavy metals, electronics and toxic materials, and are manufactured (and recycled) using much more complicated and, presumably, more ecologically damaging processes compared to those involved in traditional tungsten filaments. The question is still open thus.
LEDs are the most energy-efficient lights as of 2016.
Some discount brands of compact fluorescents have disappointed consumers and are more expensive, but don't perform as smoothly as what people are used to that's why you should get ENERGY STAR bulbs.