If you look for car LED lamps on eBay you will often see some referred to as being CANbus compatible. This is just an odd way of saying that they have an extra resistor soldered directly across the leads to make the lamp look like a high current tungsten one.
The reason they do this is to fool the cars lamp sensor system to stop it indicating a failed lamp due to the low load of the LED lamp. Unfortunately that resistor gets hot. Very hot and as it is often on the same PCB as the LEDs they also get very hot, which is bad news as they are already being pushed hard.
These lamps are generally only suited to use in low duty cycle applications like indicators that will generally just be run for a few seconds at a time and also cycle on and off in that time. But you can also fit these lamps into other continuous illumination lamp holders, and if you do that they may cause damage.
If you enjoy this channel you can help support it with a dollar for coffee cookies and dubious LED lamps for analysis at
){kind=link}