In this method, the angular subtense of the apparent source size is the essential quantity for optical hazard assessment.
这种评价方法是建立在对LED的表观光源的对向角进行测量的基础上的。
参考来源 - 高亮度LED照明的安全性评价·2,447,543篇论文数据，部分数据来源于NoteExpress
With a single light source, the most important considerations were its direction and apparent size.
单一光源，最重要的考虑因素是其方向和明显的大小。
At this point you've perhaps been slightly misled: it's not really the physical size of the light source that matters - just its apparent size relative to the subject.
在这一点上你也许有些误导：这不是真正的物理尺寸问题的光源——只是其明显的大小相对的主题。
Achieving softer light requires making the apparent size of the light source bigger.
柔和的光需要获得明显的大小使光源的大。
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