LED as a new light source in the 21st century, with green, health, environmental protection, energy saving, long life and other advantages dominated the lighting market.
The LED lamp,
LED spotlights, LED panel lamp, LED project-light lamp, LED street light, LED lighting lamps and lanterns, such as common has replaced the traditional incandescent bulbs.
So has topped the lighting lamps and lanterns, the role of the lamp bead, can be said to be the heart of lamps and lanterns, with small make up together today focuses on understanding: light bead!
A, the classification of the commercial ceiling lamps bead: according to the power size: can be divided into low power, high power,
Industry in general to 0.
More than 5 w light called high-power lamp)
According to the contour points: can be divided into direct plug-in and patch.
Straw hat LED: can according to the size of the lamp holder again subdivided into F3 (
The diameter of the lamp holder is 3 mm)
F5 (
The diameter of the lamp holder is 5 mm)
；
Or according to the shape of the lamp holder subdivided into endless, thin edge, the edge of the thick round head;
According to the lamp holder can be divided into transparent, transparent or not fog.
Piranha LED, can also according to the size of the lamp holder is divided into the F3, F5, according to the shape of the lamp holder is divided into round head,
Is one of the most common man-eating fish lamp)
, flat head,
The head is very special, its light Angle is close to 180 degrees, usually on the occasion of astigmatism)
。
Small power SMD type LED: according to the size of shape can be divided into 0805120 6302 0303 0352 8505 0506 0 or COB lamp bead.
Second, the color of the LED lamp bead common sense: LED color is determined by the different wavelength chips, for example, generally is 620 ~ 630 nm wavelength (red chip
Nm)
, green chips generally wavelength is 527 nm, general wavelength is 470 nm of blue chips, yellow chip general wavelength is 585 nm, white LED is blue chip, only in blue chips with just the right amount of phosphors is a white light.
Three, the LED current (
当前)
Common sense: low power leds (
Including the plug-in or patch type)
, each chip allows the current general don't above 20 ma;
Each double chip lamp allows the current general no more than 40 ma;
In the same way every three lights don't higher than 60 ma chip.
High power LED, I often use is 1 w, it allows the maximum current of 150 ma.
The four, LED color temperature (
colo(
u)
r温度)
Common sense: color temperature is the most common said light source spectrum quality indicators.
Color temperature is defined in absolute blackbody radiation light source in the visible region and absolute blackbody radiation at all at the same time, the temperature of blackbody is called the color temperature of light source.
Low color TPS source is characterized by energy distribution, relative to more red radiation, commonly referred to as warm light;
Color temperature increase, energy distribution, the proportion of blue radiation increases, often referred to as luminescence.
Fifth, the brightness of the LED (
强度)
Common sense: the luminous intensity and brightness, the luminous intensity or intensity, the international unit is candela (
Candela)
Shorthand CD.
Lcd is refers to the light source in the specified direction of the luminous flux emitted per unit solid Angle.
Light radiation is uniform, the light intensity for I = F/Ω, Ω for solid Angle, the unit is steradian (
sr）
, F as the luminous flux, the unit is the lumen, for point source of light by I = F / 4.
Brightness is to express the degree of shiny surface bright, refers to the surface in the direction of the luminous intensity and vertical and specify the ratio of the direction of the light-emitting surface area, the unit is candela per square meter.
For a diffuse scattering surface, although different luminous intensity and luminous flux in all directions, but the brightness of all directions are equal.
The TV screen is similar to the diffuse scattering surface, so images from all directions, all have the same brightness.
Thus, a high quality of commercial ceiling lamps,
led downlights, project-light lamp, LED street lamps and other lamps and lanterns, involve high quality light bead support!
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