1, LED classification
By welding: is divided into SMD and DIP
SMD have 3528,3020,5050 and so on, sizes such as: 3528 LED lights for the outside dimensions of 35 wide 28 long
1W chip size is usually 30 * 30mil, 38 * 38mil, 40 * 40mil, 1mil = 0.0254mm
2, the color and wavelength
Visible light range: 300 ~ 700 nm
Red red wavelength 620 ~ 625 nm
Wavelength of 590 ~ 595nm yellow yellow
475 ~ 480nm wavelength blue-blue
Green green wavelength 520 ~ 525nm
Infrared wavelengths 680nm
Fluorescent, incandescent lights for the whole wavelength
Not visible example:
Fiber divided into three wavelength 980nm, 1310nm, 1550nm
White LED structure:
Chip White LED is blue and yellow phosphor
Warm white LED is blue and yellow and red fluorescent Chip powder
White temperature is 5700 ~ 6300 ° K 6000 ° K
Warm White 2800 ~ 3200 ° K temperature of 3000 ° K
Most of the white color temperature to define the (more strict definition of the coordinate definition):
Color temperature of the definition: a piece of iron red-hot color change
° K and ° C conversion: ° K = 273 + ° C
3, the voltage vf
Red yellow: 1.8 ~ 2.5V
Blue green white: 2.8 ~ 3.6
General standard power supply voltage output is 5V, 12V, 24V, 38V
The LED current:
1W LED = 320mA ~ 350mA 3W LED = 700mA
Small power of not more than 20mA 18mA
Power calculation W = IV
LED structure:
LED silver plastic: silver + epoxy
LED gold: Φ0.9/1.2 mil gold or aluminum wire
Solid crystal: fixed chip
Wire machine: The kind of ball with the gold acts
LED light gold power: the power of not less than 9g
LED lumens value:
Red 40 ~ 45 Yellow 35 ~ 40 Blue 25 ~ 30 Green 45 ~ 55 White 90 ~ 110 Warm white 80 ~ 90 3528: 4 ~ 6 5050 or 5060: 18 ~ 20
Crystal semiconductor-producing companies:
Nichia
Osram
Cree
Toyota
Philiip clumiled
Han Cheng
Samsung
4, the circuit
IC: LM317 voltage is 2.25V, LM1117 voltage is 1.25V
Resistance:
680 = 680Ω current 18mA
3R9 = 3.9Ω current 320mA [voltage of 1.248V]
3R6 = 3.6Ω current 350mA [voltage 1.26V]
Standard full-color six-color:
R, RG, G, GB, B, BR
5, the system
1, the display system
2, DMX512,means 512 channle
Display system features:
A, control points and more
B, current small
C, low prices
DMX512 system features:
A, control points less
B, current large
C, high prices
D, world-wide
Component architecture: host + decoder + lamps
Factors affecting the price:
1, color
2, patterns of change
3, indoor or outdoor use
4, the voltage
5, LED’s Q’ty
6, the shape
7, a high polish
Lighting Interface: screw head E11, E17
Two-pin MR16 OR GU5.3,GU10.
