Some very important discoveries have been made by this technology, especially you consider that some objects in space give off radio waves but don't emit any light.

运用这项技术后，已取得了一些非常重要的发现，尤其是考虑到太空中的一些物体会发出无线电波，但不会发出任何光。

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Since most camera flashes emit IR along with their burst of visible light, the one substitution allowed the prototype to transmit and record infrared light.

由于大多数相机闪光灯在发出可见光同时就会发射出红外线，这一替换使得原型机能够发送并记录红外线。

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Whatever product you use should emit only visible light, because ultraviolet light damages the eyes.

不管你用什么产品，都应该只发出可见光，因为紫外线会伤害眼睛。

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So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.

如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级，然后它会掉回,到低能级，它就会释放,一个新的波长的光,这个光是可见的。

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It was also a big week for lighting news as we learned that compact fluorescent light bulbs emit potentially harmful UV radiation -- another good reason to make the switch to LEDs.

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Light-emitting diodes--semiconductors that emit light when electricity passes through them--have been around since the 1960s.

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Current Blu-ray lasers emit light in the blue part of the electromagnetic spectrum (about 405 nm wavelength).

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