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style="font-family:SimSun;font-size:16px;">3、效率。Q何材料制成的灯罩Q都会吸收一部分光通量Q光源本w也会吸收少量的反射光(灯罩内表面的反射光)Q减去这些光通量Q才是照明灯具向I间投射的光通量。通常以照明灯具发出的光通与光源光通之比,表示照明灯具的效率?/span> </p> <p> <span style="font-family:SimSun;font-size:16px;"><img src="/uploads/image/20200515/20200515140432_1796.png" alt="" /><br /> </span> </p></p> </div> <div class="tag">相关标签Q?a href='/key.aspx?k=%b9%f3%d6%dd%d5%d5%c3%f7%b9%a4%b3%cc'>贵州照明工程</a>,<a href='/key.aspx?k=%d5%d5%c3%f7%b9%a4%b3%cc'>照明工程</a>,</div> <div class="pre"><div>上一?<a href="236.html">贵州照明工程lh们生zd来的舒适感</a></div> <div>下一?<a href="234.html">谈贵阳亮化工程和景观亮化的区别</a></div> </div> <div class="news_related"> <div class="xg_tit">相关新闻</div> <ul> <li><a href="/news/238.html" title="谈贵州照明工程行业发展势" rel="nofollow">谈贵州照明工程行业发展势...</a><span>2020-06-04</span></li> <li><a href="/news/236.html" title="贵州照明工程lh们生zd来的舒适感" rel="nofollow">贵州照明工程lh们生zd来的舒适感...</a><span>2020-05-22</span></li> <li><a href="/news/235.html" title="谈贵州照明工程的基本特? 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