the majority of led units have the drivers mounted on the alloy plate that also houses the LED's and have no issues, the pictured model has 2 driver units, both are sealed in heatshrink plastic and placed in the neck of the unit. they get hot quick and cant dissipate the heat anywhere.
when it comes to the HID ones some had the inverter mounted in a nice alloy box with dissipating fins, some models used what i can only describe as a "sardine tin" full of silicone sealant, nowhere for the heat to go and the silicone actually stops the heat reaching the metal.
I would say i have probably repaired 1200 lights so far of varying models. biggest issue is that each batch that comes into the country might appear the same externally but internally they change
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