[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？

OSRAM OS Golden Dragon Plus Datasheet &nDXn|  
http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000200005c3a038f0023&act=showBookmark ?V,q&=9  
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Golden DRAGON Plus with silicone dome, ultra white, ThinGaN, chip level conversion, reflow solderable, lead (Pb) free – RoHS compliant lhHH|~t0  
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Features a;t}'GQGk  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion Bhxs(NO  
Typical Luminous Flux:  105 lm at 350 mA   &nP0T
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Feature of the device:  high efficient lightsource at low space &EqLF  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   +9w[/n^,G  
Color temperature (typ.):  6500 K   JD#x+~pb,8  
Viewing angle at 50 % IV:  170°   iP0m1  
Technology:  ThinGaN     iI{L>  
Typ. efficiency:  93 lm/W   <Cv(@A->  
Grouping parameter:  luminous flux color coordinates S7)qq  
soldering methods:  Reflow soldering SK l
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Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   4d`YZNvZW/  
Taping:  24 mm tape with 200/reel, Ø 180 mm   B~w$j/sWU  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D iqvLu{  
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flashlights zbmC?2$  
backlighting (illuminated advertising, general lighting) r }lGcG)  
reading lamps eAfi!!Z<  
substitution of micro incandescent lamps @j^R+F  
indoor and outdoor commercial and residential architectural lighting x="Wqcnj{  
display backlight where high brightness is required e.g. TFT =p8uP5H  
decorative and entertainment lighting (incl. fiber optic illumination) tw_o?9  
signal and symbol luminaire r,Uk)xa/^  
marker lights (e.g. steps, exit ways, etc.) kJJT`Ba&/  
street lights TI'v /=;)  
tunnel lighting _K o#36.S  
ceiling light   $D1ha CL  

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 ~w?02FU  
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加了透镜的话，就要看规格书了

附件为常见LED规格书中关于视角的示意

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%

光强极值50%到中心之间夹角的2倍，即为viewing angle

有没有固定的值呀？

那应该怎么取值呀？从产品参数中找不到呀

不是吧