The “Four Pillars of Green” is a standard by which most green products that consume energy can be measured. This allows the user to easily compare the merits of the chosen technology vs. the others on the market today. When applying this standard to lighting the following questions should be asked:
1) Energy Saving: Does it save energy as compared to a conventional light bulb?
2) Long Life: Does it have a long life compared to a conventional source?
3) Non Hazardous: Does the bulb contain any hazardous materials such as Mercury or Lead?
4) Easily Recyclable: Can the bulb be recycled easily or should it be treated as hazardous waste?
To illustrate the value of the Four Pillars let us compare a standard incandescent, a compact fluorescent and an LED. By looking at the attributes of each technology we soon see for this comparison, that only the LED bulb meets the definition of green according to the four pillars.