A: Hi Ann,
The light in these sets is produced by light emitting diodes (LED) in the base of each lens as opposed to being generated by heating a filament in a traditional light bulb.
So, no, these lights do not heat up under normal operation. Their cooler temperature makes them great for all types of applications where heat is an issue.
Since this string of lights is based on semiconductor technology (like your computer), we suggest you plug your lights into a surge protector.
As with all electrical devices, please don't operate them unattended.
Hope this helps.
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Answer provided by: Shellie Gardner (10/24/2013)