An LED bay light includes a heat pipe module, a light condenser and at least one LED light emitting module. The heat pipe module is coupled to a side of the light condenser, and both are made of a thermally conductive material. The light condenser includes a top plate and at least one reflecting plate. The LED light emitting module is installed on a side of the top plate and covered by an inner side of the reflecting plate, and the inner side of the reflecting plate is coated with a color layer. The LED bay light dissipates heat produced from the LED light emitting module by the heat pipe module and the light condenser simultaneously to improve the heat dissipation efficiency effectively, and the light of the LED bay light can change its color through the reflection from the reflecting plate or the color layer.