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SpinDistribute.com Article Directory

The following article was published in our article directory on November 4, 2014.
Learn more about SpinDistribute Article Distribution System.

Green Light for Keychain Light

Article Category: Parenting

Author Name: Diane Valkey

It has been taught in grade school or middle school that white light is the presence of all light wavelengths and black light is the absence of them. As a result, people can see every color under white light, given that they do not have any particular eye conditions like color blindness. Under white light, the objects that people see absorb every light wavelength and reflect certain light wavelengths. The reflected wavelengths appear as the the color of the object.

Why is Green Light Ideal?

White light is usually used in an ordinary LED keychain light. In fact, almost every keychain flashlight out there comes in the color white. However, when it comes to color perception, green light is the easiest for the eyes to pick up on. This is due to the fact that human eyes only have 3 primary color cones in the retina. The cones register the colors or wavelengths of light and the rods register the brightness or intensity.

The 3 primary cones in the eyes are the red cones, green cones and blue cones. The red cones are sensitive to red, orange and yellow lights. The green cones are sensitive to green, yellow and blue lights and the blue cones are sensitive to blue and violet lights. Among these 3 cones, the blue cones are the least sensitive. Thus, when blue and violet light wavelength hit the cones, it takes greater effort for the eyes to process these wavelengths. The most sensitive color cones in the eyes are the green cones.

When a cone is sensitive, it takes just a minimal amount of that light or light wavelength to be visible to the eyes. With that said, the use of green light (577 to 492 nm) for a keychain flashlight will not strain the eyes, unlike bright white light. Red light (780-620 nm) has the densest wavelength frequency. The red cones, as mentioned before, are the least sensitive to light wavelengths because red, yellow and orange light wavelengths are particularly denser than the rest of the colors in the electromagnetic spectrum.

The eye's sensitive green cones are also the reason why looking at green sceneries like gardens and grassy fields feel very relaxing. The light, due to their nature of being a wave, also has a physiological effect on the body. Red light is commonly very stimulating and agitating. It is an attention-grabbing color that must be used sparingly or else it would be stressful to the eyes to process. Blue and violet wavelengths are easy on the eyes, too.

However, the blue cones in the eyes are not sensitive to yellow and red light. If blue or red light is used, the illuminated path or object would still appear dim. Green light is the easiest for the eyes to see. Therefore, the eyes will not be strained even if they process green light for a long period of time. Green is also an ideal color for a dog collar light. Green keychain flashlight is available in Be Spotted! LED Keychain Light by Huggabe Casual Adventure Gear.

Keywords: Halloween safety light, Halloween safety light for kids, personal safety light, light for dog collar, dog collar light, flashing light for dog collar, pet collar led light, collar light for small dogs, keychain light, keychain flashlight, LED keychain light

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