Dual color indicating light shows the condition of the battery pack.

双色指示灯，指示清晰，当前状态一目了然；

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A light lit above the lever indicating drugs were available to be administered.

在操作杆上面亮着一盏灯，指示药物能够被取用。

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Tell them that it was a mistake for Google not to put a red light indicating that a photo or video is being taken, and that you hope there will be one in future iterations (even though evil folk may find a way to somehow disable the light).

WSJ: Google Glass: An Etiquette Guide

It's palm-sized with a single blue LED light indicating a connection, but honestly you don't ever need to look at it: it doesn't need line-of-sight to your handset because it uses a wireless protocol called WiFi Display, which means you can happily leave it dangling out of the way behind your TV.

ENGADGET: AllShare Cast wireless streaming dongle for Samsung Galaxy S III -- hands-on (video)

Her pupils were dilated and did not react to light, indicating that her brain was no longer working.

NEWYORKER: The Checklist