LED light or heating element?

To generate heat electrically inside a balloon for lift would a 20 watt LED light or a 20 watt heating element make more heat to lift a small closed hot air balloon droid and solar cell?

Having a black balloon would convert the light into heat and a 20 watt LED does get hot and heat-sync would add to the total heat output. I don't know if the balloon and parts being black would matter with a heating element or material would be best to use unlike traditional open hot air balloon material?

In a transparent balloon all the parts of it can be inside of it with the exception of the propellers.

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LED light or heating element?

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