[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 6:$+"@ps  
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加了透镜的话，就要看规格书了

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http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000200005c3a038f0023&act=showBookmark ~P@6fK/M  
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Golden DRAGON Plus with silicone dome, ultra white, ThinGaN, chip level conversion, reflow solderable, lead (Pb) free – RoHS compliant iLR^V!  
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Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion DwBKqhu  
Typical Luminous Flux:  105 lm at 350 mA   ]Ac&h aAP  
Feature of the device:  high efficient lightsource at low space yD\[`!sWk  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   f;Uf=.#F  
Color temperature (typ.):  6500 K  
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Viewing angle at 50 % IV:  170°   XI8rU)q  
Technology:  ThinGaN     ouO<un  
Typ. efficiency:  93 lm/W   |o0?u:  
Grouping parameter:  luminous flux color coordinates W^sH|2g  
soldering methods:  Reflow soldering KH_~DZU*5  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   ^+b ??K  
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flashlights 6OLp x)fG  
backlighting (illuminated advertising, general lighting) %g+*.8;"b  
reading lamps +,$ SZO]  
substitution of micro incandescent lamps l:?w{'i$  
indoor and outdoor commercial and residential architectural lighting W:V:Ej7 h  
display backlight where high brightness is required e.g. TFT ,MRAEa2  
decorative and entertainment lighting (incl. fiber optic illumination) Q xg)Wb#  
signal and symbol luminaire NL7CeHs5  
marker lights (e.g. steps, exit ways, etc.) U5!T-o;3}  
street lights mO|YX/>  
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