Tip: For spark in a backlit portrait or silhouette, try compositions that include the light source. This can drive your meter crazy, though, so bracket your exposures.
小提示：在拍摄背光照明的人像或剪影时，试着将光源纳入构图中，但是这样会导致测光表读数不准，因此可以尝试使用包围曝光法。
The stroboscopic light source made of high-power LEDs (higher than 5w) not only can replace the mercury stroboscopic light source, but also can greatly simplify the drive circuit.
采用5w以上的大功率LED构成频闪光源，不仅可以完全替代汞灯频闪光源的功能，而且驱动电路还可以大大简化。
This method USES at least two light sensor measurements to derive information concerning both the ambient light levels and the illumination source output level for known drive conditions.
该方法使用至少两次光传感器测量，对于已知驱动条件得出有关环境光照水平和照明源输出水平二者的信息。
In this article, we have also designed and made a drive circuit for LED and LD which is being used in optical communicating system or optical sensor system as broadband light-source.
在本论文中，我们为了实际的需要，还设计了LED和LD的驱动电路，并制作了这两组电路。我们将把它用作光纤传感系统中的宽带光源。
Test-drive clothing against a white wall, with an indirect, natural light source (under a tree, indoors near a window)--it will show whether blue really is your best color.
在非直射的自然光下（如树下或室内靠近窗户的地方），白色墙壁前试穿衣服。这样可以显示：对你来说，蓝色是不是最好的颜色。
Test-drive clothing against a white wall, with an indirect, natural light source (under a tree, indoors near a window)--it will show whether blue really is your best color.
在非直射的自然光下（如树下或室内靠近窗户的地方），白色墙壁前试穿衣服。这样可以显示：对你来说，蓝色是不是最好的颜色。
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