There are two types of led bulbs on the market Fan and Fan less . The fan type are a more complicated design and are inherently prone to more failures than the fan less type. I use both kinds and never had any problems arise. I wouldn't worry about the heat factor as I never had nor expect any problems in this area and I talked to other motorcyclist and it wasn't a problem. If any of the bulbs were completely enclosed in a airtight environment then cooling design (HEAT DISSIPATION ) would become compromised and the bulb would fail. Hope this helps with your question.