Ninety percent of people don’t know about LED beads, today I will share the knowledge of an LED bead!

LED lamp bead knowledge!

Light is a light factor that illuminates all objects, but do you know light? Today I offer some basic terms of light to help you understand it better!

1. Nature of light:

The nature of light is electromagnetic wave, which is a form of light energy in a very small range of the whole electromagnetic spectrum.

Visible light is the part of the electromagnetic spectrum that can cause human vision.

Visible light forms part of the so-called electromagnetic spectrum, which is found in radio and television signals and includes infrared and ultraviolet radiation, X-rays, nuclear and cosmic radiation. Of this electromagnetic radiation, only light waves are visible to animals and human eyes. The spectrum also includes the standard 50 Hz AC (wavelength 6000 km) and the visible portion of the wavelength 380-780 nm (=10-9 m). Different wavelengths give the human eye different color perceptions, ranging from red, orange, yellow, green, blue, indigo (that is, blue-violet) to violet.

2. Luminous flux (beam) :

Is the number of light rays emitted by the light source, in lumens (lm). For example, a energy-saving lamp emits 780 light rays, so the total luminous flux (beam) is 780 lumens.

3. Brightness:

And the intensity of illumination is almost the same definition, if we see each object as light source, the brightness is describe the degree of light source light, the intensity of illumination is the each object as an object, use a board to illustrate, when a certain beam according to the board, we speak board how much intensity of illumination, and then board how many beam reflection to the human eye, is called a board how much brightness, So brightness is equal to illuminance times reflectivity.

The illumination of a piece of white cloth and a piece of black cloth are the same in the same place in the same room, but the brightness is different.

4. Illumination:

Is the light passing through per unit area, in lx. (lm/m2)

5. Light intensity:

Is the number of rays passing through 1 solid Angle, (the density of the passing beam). The unit of light intensity is the basic unit of photometric measurement and one of the basic units of the INTERNATIONAL system of units. In order to reproduce the unit of light intensity, the reference of light was originally a candle, so the unit of light intensity was called candle. Later, with the development of science and technology, the light reference lamp was changed to tungsten lamp, and then changed to black body. After 1948, the light intensity unit was officially named Candela (CD).

6. Glare, how to control glare:

There are extremely bright objects in the field of vision or strong brightness contrast, may cause discomfort or resulting in reduced vision phenomenon, known as glare. Glare that causes reduced visual acuity is called disabling glare; Unpleasant glare is called uncomfortable glare.

Generally, there are two ways to control glare: 1. Directly control the brightness of the light source or use transparent materials to reduce glare; 2. 2. Use the protection Angle of lamps to control glare.

7, color temperature:

The color table of the light source is also called the color temperature of the light source because the absolute temperature of the complete radiator is equal or approximate to the chromaticity of the light source.

Color temperature: the color of the light emitted by the light source is the same as the color of the light emitted by the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source.

8. Color temperature psychology

Color temperature in 3300K below a stable atmosphere, warm feeling; Color temperature in 3000-5000K for the middle color temperature, there is a refreshing feeling; The color temperature above 5000K has a cold feeling. Under the irradiation of high color temperature light source, if the brightness is not high, it gives people a Yin atmosphere; Under the irradiation of low color temperature light source, high brightness will give people a kind of sultry feeling. Use two kinds of light source with very big difference of light color in the same space, its contrast will appear administrative level effect, when the contrast of light color is big, while obtaining brightness administrative level, can obtain the administrative level of light color again.

9. Physiological basis of color vision:

The light emitted by the object passes through the cornea, aqueous solution, crystal and vitreous body, so that the object image is focused on the retina, and the photoreceptor cells of the retina are transformed into nerve impulses, and then transmitted to the higher visual center of the brain, producing vision. There are two types of photoreceptor cells in the human retina: rods and cones. Rod cells have high sensitivity to light, cone cells have low sensitivity to light. So only the rod-shaped cells work at low illumination, and as the brightness increases, the role of the cones increases, and eventually the cones take over. Rods cannot distinguish colors; only cones have color vision.

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