Lighting Term Definitions

Color Rendering Index: In general terms, CRI is a measure of a light source's ability to show object colors "realistically" or "naturally" compared to a familiar reference source, either incandescent light or daylight. A low CRI indicates that the object may look unnatural or washed out, while a high CRI allows the object’s colors to look more natural.

Color Temperature: Color temperature is the simplified way to define where a light source is placed on the spectrum of wavelength as measured against a black body thermal radiation and stated in Kelvins. (Kelvin is the internationally accepted unit of measure for temperature.) Low color Kelvin temperatures imply warmer (more yellow/red) light while high Kelvin color temperatures implies a colder (more blue) light.  Visible human Kelvin temperature range is between 2,600K and 6000K.

Conventional Lumens: For years, people have chosen light bulbs by its wattage, relying over time on how bright a typical 40-watt should be, for example. But wattage tells you only how much electricity a bulb uses; not its brightness, or color temperature or color rendering. 

With newer light bulbs designed to use LESS energy, pure conventional lumens is no longer a good measurement of how well a light source produces “visible” lumens. Symbol: LM.  Lumens measures brightness but does not take color temperature nor color rendering. A standard 60-watt incandescent bulb, for example, produces about 800 lumens of light while consuming 60 watt of electricity. By comparison, a 42 watt CFL bulb produces around 2700 lumens while only consuming 42 watts.  The CFL bulbs has a higher color rendering and preferable color temperature increasing actual visible lumens.

Scotopic Vision:  In biology we learn that human vision requires the use of “rods” and “cones” in the eyes. In the dark, the Rods are used completely while the cones are not. This is called scotopic vision. Human sight is nearly colorblind with this kind of vision, since the sensitivity of the rods makes the eye more sensitive to blue light at night, while red light is almost exclusively perceived through photopic vision.

Photopic Vision:  is the vision of the eye under well-lit conditions. In humans and many other animals, photopic vision allows color perception, mediated by cone cells. The human eye uses three types of cones to sense light in three respective bands of color. This in turn means that in normal bright light, hue is available, and color discrimination is in full effect.

Mesopic Vision: is a combination of photopic vision and scotopic vision in low but not quite dark lighting situations. Most night-time outdoor and traffic lighting scenarios are in the mesopic range. In most night-time environments, there is enough ambient light at night to prevent true scotopic vision.

Photopic vision has excellent color discrimination ability, whereas colors are indescribable under scotopic vision. Mesopic vision falls between these two extremes. 

Consumer HomeWhat does this all mean for me?

Consumers: As a consumer in an ever changing economy it is always important to know exactly what the most energy efficient solutions are out there for everything.  

With the prices of lighting innovations becoming more and more accessible to the everyday consumer it becomes a matter of simple logic to stay ahead of the curve in the latest and greatest improvements to lighting your home and your business.

With solutions spanning small home repairs, to fullscale industrial projects, Jademar Corporation is ready to give you the future, today. For almost 60 years, Jademar Corporation has been steadily working on innovating new technologies and ensuring that, with competitive pricing, the latest technologies are available to private consumers and companies alike.

Professional BuildingsProfessionals:  As a business owner, as a leader, as a true professional, you understand the importance of staying ahead. In this modern world, if you are not constantly racing forwards, you are falling behind. And that is something that Jademar Corporation understands completely.

With a wide range of suppliers, an honest hardworking team and prices designed to be competitive in international markets we at Jademar Corporation are sure to be able to fit your individual needs, and those of your company.

The technologies that are available are numerous and may seem a little overwhelming, but we will make it easy for you to know exactly what technology you need to light your way.


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