萤光棒，又称犀利光、发光棒，是指造型为条状的手持照明设备，按照发光原理可以分为化学萤光棒以及电光棒（又称夜光棒）。化学萤光棒是以内外管各别分装两种液体化学成份的透明塑胶棒，外层以聚乙烯（塑料）包装，内置一玻璃管夹层，夹层内外液体分别为过氧化物和酯类化合物，经弯折、击打、揉搓等使玻璃破裂，引起两种化合物反应致使萤光染料放出光能，但它并不会产生大量热能。这个过程被称为化学萤光反应。电光棒则相当于使用电池的萤光灯或手电筒，与笔灯类似，但通常至少有一半的空间为电灯，而且多可调整发光之颜色。

A glow stick is a self-contained, short-term light-source. It consists of a translucent plastic tube containing isolated substances that, when combined, make light through chemiluminescence, so it does not require an external energy source. The light cannot be turned off, and can be used only once. Glow sticks are often used for recreation, but may also be relied upon for light during military, police, fire, or EMS operations.