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!

When electrical systems in your home start to get a bit wonky, it can be hard to determine when giving your local Rockville electrician a call is the best bet. You certainly don’t want to make an unnecessary call, but electricity is nothing to trifle with! Want to know how to make distinction? Follow along to find out when to contact your electrician!

Are you in need of emergency electrical services? Then don’t hesitate—contact Kolb Electric at 877-287-1179 immediately and we’ll get one of our fully stocked vehicles to your home or business!  

We should start by saying that any time you feel threatened or concerned about electrical safety, you should go right ahead and contact our certified electricians. Your safety and feeling of security is of the utmost importance, so it’s better to call and be sure during an electrical emergency.

Having said that, here are some situations when you definitely need professional service:

When you need a Rockville electrician, our certified emergency service professionals can bring you the best care and emergency service in a hurry! If you notice any of the issues we discussed above, be sure to contact us online or call on the phone at 877-287-1179.

It’s Zombie season! Halloween decor is already beginning to line the streets with witches, ghosts, monsters …. and ZOMBIES. And with the season premier of The Walking Dead looming on the horizon (a mere 3 days away), I’m all aflutter with the living dead.

Nobody wants to be caught in the dark with a drooling, moaning, rotting Zombie hoard, am I right? Take note fellow survivors, we’ve compiled a list of 9 must-have zombie-apocalypse light sources.

1. Solar and Battery-Operated Lights

Powered by the energy of the sun, you’ll never have to make a dangerous trip into the city to get more batteries with motion-sensor spotlights around your campsite to alert you to any sneaky Zombies.  Take them with you when you’re doing late night reconnaissance.  Doomsday Tip: Make sure there is an off-switch. Nothing worse than trying to douse your light with a zombie on your trail.

2. Good ol’ fashioned Flashlight