[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 j^m x,  
MuF{STE>->  
加了透镜的话，就要看规格书了

OSRAM OS Golden Dragon Plus Datasheet ImsyyeY]  
http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000200005c3a038f0023&act=showBookmark 'Esz#@R  
,qwVDYJ  
LUW W5AM r1[#_A`Yn  
:aR_f`KMm  
Golden DRAGON Plus with silicone dome, ultra white, ThinGaN, chip level conversion, reflow solderable, lead (Pb) free – RoHS compliant "Bl6)qw  
'}9 %12\^h  
Features `{H!V~42  
Package:  white SMT package, colorless clear silicone resin clear silicone lens chip level conversion nG~^-
c+  
Typical Luminous Flux:  105 lm at 350 mA   t/J|<Ooj?  
Feature of the device:  high efficient lightsource at low space .o)  
Color coordinates:  x = 0.31, y = 0.32 CIE 1931 (weiß)   uJU;C.LX  
Color temperature (typ.):  6500 K   G;AJBs>Y}  
Viewing angle at 50 % IV:  170°   O|0V mm  
Technology:  ThinGaN     bKQ_{cR  
Typ. efficiency:  93 lm/W   B4{F)Zb  
Grouping parameter:  luminous flux color coordinates 
FW:V<{f  
soldering methods:  Reflow soldering V-ONC
  
Preconditioning:  JEDEC Level 4 according to JEDEC S-STD-020-D   ~\u~>mtchu  
Taping:  24 mm tape with 200/reel, Ø 180 mm   ^K0oJg.E  
ESD-withstand voltage:  2 kV acc. to JESD22-A114-D iQvqifDmh  
E=]$nE]b  
C ett*jm_  
gl
Zjo  
^%NjdZuDO  
ZM_-g4[H  
Applications 
;R7+6  
flashlights grE'ySX0  
backlighting (illuminated advertising, general lighting) 7~H"m/;U&  
reading lamps E
n ]"^*  
substitution of micro incandescent lamps =U}!+ 8f  
indoor and outdoor commercial and residential architectural lighting { {+:Vy  
display backlight where high brightness is required e.g. TFT +r$VrNVs  
decorative and entertainment lighting (incl. fiber optic illumination) ~|&To>  
signal and symbol luminaire 3bagL)'iz  
marker lights (e.g. steps, exit ways, etc.) Rts.jm>[  
street lights R<Ct{f!  
tunnel lighting ggUw4w/e  
ceiling light   Z9zsvg