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Web当P(X)以瓦为单位时,Y(X)的单位为光瓦.只有当X=555nm时,1瓦光辐射功率产生683lm(流明)的光通量。 由于人眼对不同波长的光的视见函数不同,所以不同的波长的光的辐射功率即使相等,其光通量并不相等。 Web普通的卤素灯功率大约是55瓦,而氙气大灯一般只有35瓦,led大灯的功率就比较多了,20多瓦,30多瓦,甚至80瓦都有,主要看你的车会不会检测灯光功率,很多车都会对大灯的 … btu in gas water heaters
氙气灯55w光通量是多少 - 百度知道
Web干活的话佳能单反配个18-55很好用,因为做饰品的宝贝都很小,镜头对焦最近距离要越近越好, 18-55很OK!. 写着是0.25厘米 但是我发现拉长焦拍也完全够用!. 反正从18-55开始没错的,如果18-55都吃灰了,其他头更难逃了。. 我的18-55都用到变形了,用出感情来了 ... Web55th parallel north. The 55th parallel north is a circle of latitude that is 55 degrees north of the Earth's equatorial plane. It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean . At this latitude the sun is visible for 17 hours, 22 minutes during the summer solstice and 7 hours, 10 minutes during the winter solstice. Web流明,是描述光通量的物理单位,物理学解释为一烛光(cd,坎德拉Candela,发光强度单位,相当于一只普通蜡烛的发光强度)在一个立体角(半径为1米的单位圆球上,1平米的 … experian micromarketer