Lighting. Friday , September 21st , 2018 - 21:59:45 PM
Another of the reasons why LEDs are proving so popular as lights is their ability to produce color specific light. Unlike incandescent bulbs which normally require a colored lens to produce the red, blue, and green colors necessary for navigation lighting, LEDs can produce these colors naturally. This means that clear lenses can be used, resulting in a brighter navigation light without the colored lens that can reduce the fixtures overall light output. While LED navigation lights are certainly available with colored lenses for the purists out there, they simply aren't necessary and in reality reduce overall effectiveness.
An object's colors act as discriminate reflectors meaning they will only reflect their own color. The reason why we can see all the colors present in the objects around us is because white light contains all the colors of the visible spectrum of colors, so it highlights them all. This concept of how light works becomes important when we want to highlight something in a certain way. For instance let's say we have a red rose with a green leaf. If the rose was lighted with only a red light the green leaf would appear to have no color or it would appear to be black. This concept could also be flipped the other way in lighting the rose with a green light the red rose would appear to have no color or look black. Remember if the color isn't in the light source you won't see it in the object being lighted. When we look at the color light spectrum there are colors that are weak at certain points and stronger at others. If you have a light source that is stronger in any one color or colors it will tend to emphasize those colors and mask the other colors present.
It may be easier to think of colored LEDs (RGB) and white LEDs in terms of another industry: Automotive. RGB LEDs are like the internal combustion engine: Reliable, abundant, easy to use and manufacture, and fairly well developed in terms of the potential for new or breakthrough technologies. There are lots on manufacturers and each has their own set of patents and "tricks of the trade" to help give themselves some marketing leverage over the competition. White LEDs are like the alternative energy industry for transportation: Quite varied, still relatively "new", still needing to be market proven, more expensive, more challenging to manage. There are many manufacturers, each using a different technology or combination of technologies to achieve what they believe is the "the next big thing." Following this analogy, RGB LEDs are mature enough to compete on cost alone and the drop in costs is what fuels new applications for colored LEDs that had not been thought of previously. White LEDs, on the other hand are still developing technically and should not be shopped based on cost alone. The need for quality and longevity is what fuels the further research and development into white LEDs.
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