In this series, we’re helping you save energy at your homes and businesses, room by room.

We’re pulling out all the stops to give you the best tips to use in the bedroom – for energy-efficient lighting, that is!

1. Take a survey of all your light fixtures – table lamps, floor lamps, track lights, and any ceiling fans, chandeliers, or pendant lights. How many of these use incandescent light bulbs? If the answer is greater than zero, we’ve identified the first way you can cut down your energy consumption in the bedroom: Swap out all your incandescent household, chandelier, and reflector light bulbs for

Using only 0.3 watts of power, it won’t cost you more than $0.20 to operate each year. That’s 90% less than the traditional incandescent. Not to mention it has a 100,000-hour rated life!

4. What other light fixtures do you use? Wall-mounted reading lights? Shelf lights? Display lights? You can save even more energy by upgrading these fixtures to LED or fluorescent.

Now, why is the blue LED so important? Quite simply because there are no white LEDs. The white light that our eyes detect is created by using a blue LED and some yellow phosphor. The yellow phosphor coating may be placed directly on the blue LED or on the glass envelope that houses the blue LED. Either way when the blue light from the blue LED passes through the yellow phosphor the resulting light appears to be white.

In late 2014 at the Nobel Prize Award Ceremony in Stockholm, Sweden, the three Japanese scientists who developed the blue LED while working at Nichia Chemicals will share the Nobel Prize in Physics for their work on the blue LED. In official terms the Nobel Committee awarded this year’s physics prize to Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura “for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources.”

Furthermore, the Nobel Committee pointed out in its announcement that the results of all the scientists’ hard work will be on display everywhere as the three recipients make their way through Stockholm: “the light from their invention will be glowing in virtually all the windows of the city.” And they can be assured that, as this century progresses, the ascendancy of the LED will only become more dramatic.

Electricity gives us light, warmth and many of the conveniences of modern life. It powers industry, our homes, our schools and our offices, yet most of us take it for granted. Do you know where your electricity comes from or how it reaches you to provide the energy you depend on? It's Grid Week, and the Department of Energy's Understanding the Grid infographic gives a bite-size education on how electricity is generated, transmitted and distributed to our homes and businesses.

A bit of mathematics at the end of the week. The

The first table shows three different installations. The old one is equipped with T8 fluorescent lamps that are at the end of their lifetime and dirty. That is why the luminous flux is so low for the 60W tube. In this situation, the need for a replacement is present. The choice is between a fluorescent tube, a LED tube or a completely new installation with controls. Controls reduce the average power consumption to 1/3 and less of the original load. We can estimate the new fixtures will consume 12W only when connected to controls that detect presence in the hall and reduce the lighting level in areas that are not in use. Each light point will be replaced. It is (often) possible to reduce the number of fixtures with a new installation. The example is concentrating on a one-by-one replacement to make it easier to understand.

The table above shows the sum of all costs for running and maintaining the installation each year and in total. The Retrofit Solution reaches an ROI after 2 years already. The New Installation with controls is going to turn back the high investment after 10 years. Both LED solutions do better than the conventional one, save energy and CO2 emissions. Let’s go green with LED light sources!