The item we use daily, the light bulb, has quite a history. Most people credit Thomas Edison with the invention yet creating light from electricity pre-dated Edison by many decades. Around 1810 for instance, a couple of batteries and charcoal rods illuminated and then if was almost 100 years later that a filament was created. It was then the adding of a glass globe surrounded by nitrogen which caused the amount of illumination to double. What Edison did as an improvement was commercialize its use with his Pearl Street Station as a mass producer (and then distribution center) to the public.
Three decades later florescent bulbs came out with a lot of inventions from WWII. Twisty CFLS (compact florescent lights) came about in the mid 1970’s (not yet ready for public use) and 15 years prior LED’s (light emitting diode) came out. But the LED’s were restricted to red, then green and finally blue light with a coating that eventually gave it a whitish blue hue.
Each step of the way efficiencies were increased while reducing the amount of heat output was decreased. Often the best way to use less energy in a building is to swap out the less efficient (from a lighting point of view) bulbs for the more efficient ones. For instance, LED’s use 75% less electricity than the glass globe incandescent bulbs with filaments.
Keep your eyes open for more efficient lights as they come out into the markets- then compare the cost savings from electrical conservation with the longevity and final cost of the bulb to see if it is worth getting considering the amount of time you think you will be using the light. You can measure your use of at least lamp lights in your home with devices such as the Kill-o-Watt. Keep the home fires burning- but efficiently!