[求助]LED的发散角 [复制链接]

请问LED的参数中viewing angle是什么意思？是它内部的反光碗的发散角吗？

不是吧

那应该怎么取值呀？从产品参数中找不到呀

有没有固定的值呀？

光强极值50%到中心之间夹角的2倍，即为viewing angle

4楼说得有理,通常取50%时的角度,而LED规格书也是注明发散角的角度也是在50%

附件为常见LED规格书中关于视角的示意

倘若LED封装无透镜设计的话，那么辐射体为朗伯体，其全视角（viewing angle）为120度 C3(h j  
p+b$jKWQ  
加了透镜的话，就要看规格书了

OSRAM OS Golden Dragon Plus Datasheet 1Afy$It/{  
http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000200005c3a038f0023&act=showBookmark ,,lR\!>8  
M;YJpi  
LUW W5AM >=.3Vydi1  
!-ZY_  
Golden DRAGON Plus with silicone dome, ultra white, ThinGaN, chip level conversion, reflow solderable, lead (Pb) free – RoHS compliant S27s Rxfr  
h67{qY[J[  
Features lR]FQnZ  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion > }kZXeR|  
Typical Luminous Flux:  105 lm at 350 mA   6Xbf3So  
Feature of the device:  high efficient lightsource at low space ,T;D33XV  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   dXsD%sG@  
Color temperature (typ.):  6500 K   F_4Et  
Viewing angle at 50 % IV:  170°   RF~G{wz  
Technology:  ThinGaN     3{wuifS  
Typ. efficiency:  93 lm/W   t]?{"O1rC  
Grouping parameter:  luminous flux color coordinates d]N_<@tx9  
soldering methods:  Reflow soldering XWq"_$&LF  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   V/zmbo)  
Taping:  24 mm tape with 200/reel, Ø 180 mm   gAf4wq  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D @jrxbo;5  
D|^N9lDaQ  
>7~,w1t  
eBY/Y6R  
~ H/ZiBL@  
JVr8O`>T  
Applications c c/nzB  
flashlights pgZQ>%  
backlighting (illuminated advertising, general lighting) &>QxL d#  
reading lamps u! dx+vd  
substitution of micro incandescent lamps *zW]IQ'A  
indoor and outdoor commercial and residential architectural lighting 5u3KL A  
display backlight where high brightness is required e.g. TFT -Kcjnl92i  
decorative and entertainment lighting (incl. fiber optic illumination) ze21Uj1x*  
signal and symbol luminaire D0z[h(m  
marker lights (e.g. steps, exit ways, etc.) ^YB2E*  
street lights =%s6QFR  
tunnel lighting gyhy0  
ceiling light  
=K}T; c