Why is LED Lighting is Energy Efficient?
To understand we need to see how an incandescent works. An incandescent light uses a strong electrical current to heat a thin metal wire, called a filament. The metal grows so hot that it begins glow. The metal cannot ignite because it is contained inside a vacuum in the bulb, however it does give off a tremendous amount of energy. However, only about 20 percent of this is energy is in the form of light, the rest is almost all wasted as heat.
LEDs do not use heat to produce light. Instead it uses a small electrical current to excite electrons, which in turn release energy as light. Only a very small fraction of the energy is lost as heat.
What Does "Color Temperature" Mean?
Color temperature is a measurement the color or hue of light. It is measured on the Kelvin Scale, often abbreviated to “K”. In general the lower the number the “warmer” or more yellow the color and the higher the number the “cooler” or more bluish-white the color.
Candlelight = 1500K (Very Warm White)
Incandescent bulbs = 2700K (Warm White)
Halogen bulbs = 3000K (Cooler warm white)
Sunlight = 4200K (Natural white
Blue Sky = 5000K (Cool white)
Overcast Daylight = 7000K (Cool White)
What Color Temperature Do I Need?
This is largely a combination of what the light will be used for and personal taste. If you currently use incandescent lighting, and like the warm, yellow glow it provides, than an LED with 2700-2900K is the perfect energy efficient substitute. This will give your décor a warm and inviting look.
If you prefer the look of warm white look of halogen bulbs, then a warm white 3000K LED is perfect. It’s a good combination of a warm, inviting light, and a clean cut, modern look.
If your décor has a modern, clean look or is largely white, you might prefer a bulb in the 4000K-5000K range. The Natural and Cool White Lights bring out color, without overwhelming. This color range closely mimics natural sunlight.
How Does LED Lighting Work?
The LED (light emitting diode) works by using an electric current traveling through a negatively charged anode to a positively charged cathode. Basically, a diode only allows an electric current to travel in one direction. This current causes electrons to recombine, which releases energy in the form of photons, AKA light.