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The LED luminaire is hot to touch. Why is this?

The LED luminaire is hot to touch. Why is this?
Update Time:2019-02-28
The LED chip, or light engine produces heat. This needs to be dissipated as quickly as possible. This is normally done by with a heat sink, which often has fins. Cool LEDs are more efficient than hot ones. They also have a longer life. Of course, higher power LEDs generally run hotter than low power ones because of the extra heat to remove.