There are many terms used to specifically
describe the various aspects of fluorescent lighting and the technology behind
the engineering and manufacturing of them.
One such term used to help define color in fluorescent light is CIE (Commission
Internationale de l’Eclairageis), the international standards organization that
sets the standards for color and color measurement.
Fluorescent lamps may be described as cold cathode. This type of lamp has a cylindrical metal
shell (electrode) covered on the inside with an emission coating. Cold cathode lamps are not heated to induce
thermionic emission of electrons such as in hot cathode lamps, but rather, their
interior surface produces secondary electrons upon electron and ion
impact. To accelerate ions to a
sufficient velocity in order to create free electrons, cold cathode lamps
require higher voltages than hot cathode lamps.
Hot cathode lamps usually have a
higher power density than cold cathode lamps and emit more electrons from the
same surface area, which results in a higher output and the ability to operate
at a higher lamp current. Generally the lamps
have a tungsten filament covered with an emissive layer made of material with
lower work function that emits electrons better than bare tungsten metal. The filament is either directly heated, where
the filament itself is the source of electrons, or indirectly heated, where the
filament is electrically insulated from the cathode.
Another important term in fluorescent
lighting is CRI (Color Rendering Index), which quantitatively measures a light
source’s ability to render color on a scale of 0 to 100 percent and is
independent of color temperature. If the
light has a CRI of 85 to 90 percent, it is considered good at color
rendering. A rating of 90 percent or
above, offers the most accurate color discrimination. If you need more information and clarification
on our lamps, please see our website.
LightSources and our affiliated
companies represent the leading high-tech designers and manufacturers in the
lamp industry today. Our products are
used world-wide in a multitude of applications and industries such as our
avionic display backlighting that is part of the National Defense and US Space
Program. Please contact us to learn more
about our extensive selection of lamps.
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