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DRL's do not burn hot. The characteristics of led's allow high light output for minimal heat output. Conventional globes heat a wire to white hot in order to produce light, led's do not. Having said that, the new headlamp bulbs are commonly fitted with a heat sink, or a fan due to extremely high output requirements.
...on the i30 (or, if mounted behind/through the bumper, would require extensive work to the impact absorbing foam/polystyrene behind it to both fit and have sufficient cooling - and that...
Yes, it all depends on the rated current the device has to handle. I have DRL's on my car, with no apparent heat sink other than the housing they are built in. They too are quite bright but are not consuming high wattage. A std led will glow @ full brightness @ just 30 milliamps, so not a lot of heat to dissipate.Anyhow, good luck with your project.
When I say my car, I mean the Holden Commodore. You want a photo of THAT.
Have you? Any chance of a photo Phil?