The jargon in the lighting world can often get mixed up. Color rending index (CRI) and color temperature are one of the most to be confused with each other. This post is going to clarify what the different between CRI and Color Temperature is so we can end this confusion.

Here is a short explanation why the CRI is more important to focus on before deciding for a color temperature. The color rendering index is the most important feature in certain applications as it determines the appearance of objects, faces and spaces. If this aspect is not relevant, the CRI can be as low as 60 or even 40.

The color rendering index (CRI) is a numeric evaluation of the light color accuracy with the reference of daylight (numbered 100). Sunlight and its broad spectrum will enable a person with normal vision to see 68 different colors in a color chart, but if the chart is illuminated by a light source of one wavelength only, each color from the color chart will appear as a different brightness of that one color. Some activities, such as walking or operating a vehicle, do not require the accurate perception of surface colors while others such as product selections in shops benefit from better color rendering features. Look at the application of the lighting installation. If the visual tasks are easy to perform the CRI doesn’t need to be high. In areas like offices, handcraft manufacturing and surgery, the requirements for visibility, contrast, visual guidance as well as face recognition need to be provided by a lighting system with a good CRI of >80 or even >90.

How much is the light color affecting the space? The term color temperature describes the temperature of objects by which they emit light, modeled through the “blackbody radiator”. When increasing the temperature of a “blackbody”, it starts to emit visible light in a continuous spectrum. The filament of a 60W incandescent lamp heats up to about 3000°F, as a result the lamp emits light with a color temperature of 3000K. Many of our artificial light sources do not create light by heating up a material until it glows like an incandescent lamps. Instead of creating a continuous spectrum, they generate an assortment of color emission lines. A blackbody color temperature cannot be directly given to this non-blackbody type of emission, generated by high intensity discharge and fluorescent lamps for example. For those light sources, a correlated color temperature (CCT) is indicated, based on the blackbody color temperature. A cool white fluorescent lamp has a CCT of about 5000K. The lamps light spectrum is different from a blackbody one but has the same temperature.

The light color influences the atmosphere in a space. The more cozy the ambiance the warmer the light color (lower color temperature) should be and the more dynamic the scene the cooler the light source (higher color temperature). The CRI is the most important factor to watch when choosing light sources. How good is the light source representing faces, colors and contrasts? The easier the visual task and perception the lower the CRI can be. The color temperature needs to be watched second, it is supporting the space’s atmosphere.

Conclusion

There you have it; an explanation of both the Color Rending Index and Color Temperature.

Have anymore questions or thoughts? Comment them down below!

Sometimes the bad news about energy and the environment in the media can be overwhelming. Good news tends to get pushed aside in favor of spectacular disasters. Yet, every day in towns and cities across America, people are working on green energy projects that both help the environment and save money. This shouldn’t be a surprise — survey after survey has found that most Americans are concerned about the environment, and most cities today are scrambling to save money.

Energy Saving Light Bulbs in Street Lights. Replacing conventional incandescent electric bulbs with LED bulbs in street lights is one popular green energy project. In the largest such project in the world, Los Angeles is replacing the bulbs of 140,000 street lights. The LED bulbs use considerably less electricity, creating not only money savings but also savings in the oil and coal needed to generate electricity. When complete, the project will save the City $10 million each year. Of that, $2.5 million will be saved on maintenance costs and $7.5 million in electrical usage. The project will also reduce carbon emissions from electric generation by 40,500 tons per year. That’s like taking 6,700 cars off L.A. streets for the life of the bulbs – every year for 10 or so years.

L.A. City engineers originally hoped that the LED bulbs would save 40% on electric bills. When they measured the savings of switching over the first 20,000 bulbs, they were pleasantly surprised to find that the savings on electricity was more like 55%. The City has also found that the LED lights create brighter and more uniform visibility, reducing pockets of dark shadow that conventional street lights tend to leave.

L.A. Mayor Villaraigosa commented proudly, “We’re seeing L.A. lead the way.” The project is being funded, in part, by Federal stimulus dollars as well as the Clinton Foundation. Sarah Potts of the Clinton Foundation said, “The Clinton Climate Initiative was excited to work on this project mainly because L.A. was willing to be a mover on this. They were willing to set the bar for where energy efficiency street lighting could and should go.”

However, L.A. is not alone. This type of green street lighting project is being undertaken from Ann Arbor, Michigan, to towns in Northern California, where PG&E, the electric utility, gives rate breaks and rebates to its street light customers who switch over to LED bulbs.

Green Energy Projects at Home. We don’t have to wait for government projects before we can start saving money by helping the environment. If you want to go greener in your own home or business, you can take steps that range from quick and simple to more ambitious:

1) Replace the bulbs in your home with compact fluorescent bulbs (CFLs). Today’s fluorescents fit into regular lamps and fixtures, come in a range of warm colors, and save electricity. While CFL bulbs cost more at the supermarket, they last longer than old-fashioned incandescents, and so cost less over their lifetimes. You can start by buying a four-pack on your next trip for groceries. Unscrew the bulbs in the light fixtures you use most often and screw in the new bulbs. It’s that simple. If you have any questions, you can call The Electric Connection, your Los Angeles electrician.

2) Install a ceiling fan. Ceiling fans are very efficient when it comes to cooling a room. Set your thermostat for the air conditioner 2 degrees higher than usual, turn on your ceiling fan, and you’re achieving the usual cooling effect while saving money and electricity.

3) Here’s a more ambitious green step. Make your next car an electric hybrid or all-electric. Electric vehicles reduce our dependence on foreign oil — 60% of our oil imports are burned in our vehicles. Electric vehicles are available today that are competitively priced, convenient, and also give you the benefit of freeing you from the ups and downs of gas prices while enjoying the satisfaction of helping the environment. When you’re ready to make the move, keep in mind that The Electric Connection, a fully licensed and bonded electrician in Los Angeles CA, installs electric vehicle chargers.

If you see solar panels on some of the buildings in your town or if you’ve purchased an Energy Star appliance or installed compact fluorescents in your light fixtures, you and your town are part of the green energy movement that is quietly growing throughout our country. To find out more, call The Electric Connection, a knowledgeable green Los Angeles electrician. To visit their website, simply type in electrician Los Angeles CA on a web search, and you’ll very easily find their site near the top of the first page.

Click here to visit our website.

One of the most popular ways for the average homeowner to decrease their dependency on fossil fuels for electricity is solar installation. As it becomes easier to access this incredible source of renewable energy, more and more homeowners are considering it as an actually viable option for energy generation in their home. Here are a few of the options that you have, when it comes to installation solar panels on your property.

Professional Solar Installers Provide Value

Although you may be tempted to try to install solar panels on your homes in order to avoid much of the solar panels cost, there are a number of benefits that come from working with a qualified solar installer. By working with a professional, you will know that your panels were installed by someone who works extensively with this technology on a daily basis. This means that they have ongoing and extensive training installing panels and connecting them to your home under a number of different conditions. Plus, these are the people who have all of the best connections with your local solar power industry, giving you extended insight into options, discounts and special programs.

Are You Aware of Solar Leasing?

Because most homeowners have never heard of solar leasing, it’s no surprise that it is less utilized than it actually should be. This great innovation is a great way for homeowners of all different income levels to lease a solar panel array that is perfect for their home. Whenever you enter a solar lease, you simply pay a monthly fee to have the panels installed on your home. Once the panels are installed, they remain the property of the solar leasing company. All of the electricity generated, however, belongs to you. In most cases, this results in a net gain as a result of the energy savings experienced.