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!

Time to fall back and re-adjust to a new light!  Daylight Savings Time ends on November 2nd and our circadian rhythms may be upset as we are forced to accept the darker mornings.

Don’t despair, a few simple tips will help make for an easy transition.  From landscape to living room, we’ll show you how to adjust your lighting design for the change of season.

3 Surefire Ways to Keep your Circadian Rhythm in Check and Attune your Light to the Season

1.  PERFECT TIMING:  Reset timers on outdoor and landscape lighting.  Timers for outdoor lighting should be set to go on after sunset.  Automated timers may be wall-mounted indoors or on transformers outside.  Newer systems may be powered to photocells which adjust light fixtures automatically for Daylight Savings Time. Photocells are activated by natural sunlight, so that lights will go as soon as it gets dark outset.  For the coming winter months–timers for outdoor lighting should be programmed to go on around 5 pm and shut-off around 3 am.

2.  KEEPING YOUR SPIRIT UP:  Many individuals experience a lack of energy and/or depressed mood during the winter months due to their decreased exposure to sunlight.  Adding daylight bulbs to table or floor lamps will brighten up your interior space and may help to keep your energy and spirit up throughout the day.

Frosted True Daylight lamps from Bulbrite Industries utilize neodymium to replicate sunlight to  help you “see better, feel better” and adjust to seasonal changes.

3.  STAYING IN TUNE TO THE NEW NORMAL:  Studies have confirmed that lighting our homes and offices in tune with our natural circadian rhythms is beneficial to overall performance and well-being.  “Tunable” lighting is the wave of the future.  From setting our lighting designs to be in perfect unison with our sleep-wake-performance schedules to illuminating entire rooms in our favorite colors, we have the technology to change our lighting design according to the season and the ceremony!

Visit with a professional lighting consultant at a Capitol Lighting showroom or 1800lighting.com for personalized attention to your lighting design scheme.  Keep abreast of the latest lighting news at 1800lighting.com.

A recent study conducted by the National Association of Home Builders (NAHB) found that homes constructed within the past decade are significantly less expensive to maintain than properties that were built a generation ago. On average, the combined annual maintenance and utility costs of a home that was built in or after 2008 is roughly $241, while the same yearly price to live in a home built before 1960 is $564 a year. There is also a noticeable variance in the average operating costs of houses built during these two periods - properties constructed more recently only have operating costs of roughly 3 percent while those built before 1960 averaged 5 percent.

A large factor is the kind of plumbing, wiring and overall utility setup of a given property. Over the past several decades, streamlined construction methods and an overall "greener" sensibility among shoppers have led to the development of more energy conservative appliances and layouts that cut monthly power and plumbing costs.

For example, the federal government offers homeowners a tax credit when they replace older appliances with Energy Star-approved ones. The results are savings in both the short term, with the immediate rebate most suppliers offer, and long term when monthly utility savings are taken into consideration.

Even manufacturers must meet higher efficiency standards today than in the 1960s whether or not they are looking for an Energy Star certification.

Nuclear energy is often thought to be a bad idea; however, there are several different advantages to using this style of energy. There is a huge array of benefits over other forms of energy, including wind, hydroelectric, solar, and coal. Many people claim that nuclear power is bad for the environment; however, if used correctly it can be incredibly efficient.

Surprisingly nuclear power is far more energy efficient than many other forms of alternative energy, and materials which are needed can be found easily. The plants, which are built to house the nuclear energy, are cheap to run and incredibly safe. There have been accidents in the past; however, today, nuclear power plants have strict guidelines.

There are of course risks with this form of producing energy; however, these risks are less than the risks surrounding other forms of energy supply. The unique advantages, which nuclear power has over alternative energy sources, guarantee that it remains popular. This highly concentrated form of energy requires very little fuel.

The waste, which is produced from the nuclear energy, is also incredibly small, ensuring that there are no problems caused by the plants. In fact, the waste, which is produced, can be used as a fuel for the next stage in the production of energy. The nuclear industry ensures that they practice responsible manufacturing at all times. The nuclear power is stored safely at all times, with no adverse effect on the environment.

The area of land, which the nuclear energy plant requires is incredibly small and can be placed in unique areas. Many of the other alternative energy resources require huge plots of land, which can be a problem in some countries. Hydroelectricity will also submerge vast amounts of fertile land, causing a loss of valuable assets.

You will also discover that nuclear power is incredibly sustainable, which has the full potential of serving mankind for many thousands of years. When fossil fuels have vanished, this form of energy will continue to be produced. The fuel is also incredibly economical to produce, which is ideal for producing energy at an affordable price for everyone.

The base load to the grid can perform every single day, regardless of the conditions in the air, and what temperatures it is where the plant is positioned. Solar, wind and hydroelectricity, are all affected by weather conditions.

With the challenges, today that many people face, you will discover that alternative energy can have issues. Therefore, you may need to consider nuclear energy and research all of the different benefits which there are with this energy source. This style of power is a clean and pollution free way to produce the energy, which you need.

Many homeowners don’t realize just how much danger their home could be in if they have a faulty or outdated electrical panel. This panel is where the main power line from outside the home enters and is routed through the electrical system. It also disconnects circuits if excess electricity flows through them by tripping circuit breakers. However, if a panel starts to malfunction to the point that it can’t operate correctly, then you could be at risk for a major outage or even electrical fires.

If you have an aging service panel, then it is imperative that you pay attention to the signs that it’s time for an upgrade—before it fails completely. If you notice any of the below warning signs, be sure to call a professional electrician to immediately inspect the panel and see if repairs will be sufficient or if an upgrade is necessary.

As we mentioned, constantly tripping circuit breakers are caused by excess electricity. This is common in aging electrical panels since today’s electrical demands have increased so drastically. If you have circuit breakers that are constantly tripping, then chances are that your panel can no longer handle the demand your home places on it.

Wires that wear down within your electrical panel can create small fires. Fortunately, these often quickly burn themselves out. However, they will leave behind signs that they’ve occurred, which should never be ignored. If you discover an acrid smell coming from the panel, or if you notice charring or discoloration around the circuit breakers, then electrical fires have probably already occurred, which warrants attention to your electrical panel.

When a circuit breaker trips, you should be able to just reset it and be back in business. However, if you discover that a circuit breaker within your electrical panel won’t stay reset, or it doesn’t restore power, then you likely have a faulty service panel. A professional electrician will be able to determine what the problem is and the best way to fix it.