led 的视角大小与光的强度有关系吗？
<p>大部分我看是25度，有的是15度，还有的是120度的。是不是视角小，聚焦的效果好？</p> 另外13lumen相当于多少mcd? <div class="quote"><b>以下是引用<i>虾段</i>在2007-03-02 11:51:52的发言：</b><br /><p><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">引用自本论坛：对于各向同性的光（即光源的光线向四面八方以相同的密度发射），则</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体"> F = 4πI</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">。也就是说，若光源的</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体">I</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">为</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体">1cd</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">，则总光通量为</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体">4π =12.56 lm</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">。</span></p><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa"><p><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">如果一只LED反光角度15度，10000mcd（10cd），</span>是不是这样计算此LED的光通量：</p><p>F＝12.56*10*15/360＝5lm</p><p>请高手指教</p></span></div><p>式中360是2D，而光通是3D，正研究中！</p> <p>我有点晕了</p><p><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">引用自本论坛：对于各向同性的光（即光源的光线向四面八方以相同的密度发射），则</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体"> F = 4πI</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">。也就是说，若光源的</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体">I</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">为</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体">1cd</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">，则总光通量为</span><span lang="EN-US" style="font-size:9pt;color:black;font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa;mso-fareast-font-family:宋体">4π =12.56 lm</span><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">。</span></p><p><span style="font-size:9pt;color:black;font-family:宋体;mso-ascii-font-family:tahoma;mso-hansi-font-family:tahoma;mso-bidi-font-family:tahoma;mso-font-kerning:1.0pt;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa">这是什么意思</span></p>
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