Frequently Asked Questions

Here you will find various frequently asked questions pertaining to LEDs and LED lightbulbs.

What is an LED?

LED is an acronym which stands for light emitting diode.

 

LEDs are semiconductors and when switched on, electrons are able to recombine with electron holes within the device which releases energy in the form of photons and heat. This process creates the light that LEDs emit.

What is Color Temperature?

Color temperature is a measurement of how bright an LED will emit light, measured in Kelvin. A high color temperature means the LED will emit an extremely white light and conversely, a low color temperature means the LED will emit a warmer white light.  

 

Below is a table filled with examples of color temperatures associated with their respective examples.

Examples of Color Temperature 

Color Temperature

Example of Light Emitted

 1,700K

 Match Flame

 1850K

 Sunset/Sunrise, Candle Flame

 2700-3300K

 Incandescent Lamps

 3000K

 Soft White CFLs

 3200K

 Studio Lamps, Photofloods

 3350K

 Studio "CP" light

 4100-4150K

 Moonlight

 5000K

 Horizon Daylight

 5000K

 Cool White CFLs

 5500-6000K

 Electronic Flash

 6500K

 Daylight, overcast

 6500-9300K

 LCD or CRT screen

15000-27000K

Clear Blue Northern Sky

What are Watts and Lumens?

A Watt is a unit of measurement for power (J/s), where as a Lumen is a unit of measurement for perceived light (lm). A simple formula is used for converting between Watts and Lumens:

 

ΦV(lm) = P(W) × η(lm/W)

 

Where ΦV stands for the Luminous Flux, P stands for Power, and η stands for the Luminous Efficacy of a light source.

 

As an example, take a 60W incandescent bulb. It produces anywhere from 750-850 Lumens. This means that the Luminous Efficacy of a 60W incandescent bulb is on average 13.3 Lumens per Watt. Compared with an LED light source, a 6W bulb produces 400 lumens on average. This computes to 66.7 Lumens per Watt.

 

What does this mean? 

 

It means that LED lighting is significantly more efficient than its incandescent counterpart. The energy saved from a 6W LED bulb equates to 53.4 Lumens per Watt for a tenth of the power consumed. 

 

This means that a 6W LED bulb is extremely more energy efficient than an icandescent bulb!

What is Beam Angle?

Beam angle is the angle at which light is emitted. For example, if an incandescent bulb has a beam angle of 360 degrees, then light is emitted in all directions. If a fluorescent T8 tube has a beam angle of 120 degrees, then light is emitted in a 120 degree angle.