It isn't as simple as swapping out your halogens for LEDs. If you don't get the right LEDs, they'll burn out much faster than the halogens, or not be bright enough, not light up their housings, cause rapid flash, or interfere with the car's electrical systems.where would be a good place to go to to convert ALL the bulb numbers in the owners manual to led numbers
As far as bulb numbers go, they should be the same as their halogen variants. Visit Evilution - Smart Car Encyclopaedia for a guide on bulb numbers.
As for the right LEDs:
- For the turn signals, brake lights, taillights, third brake light, and turn signals on the door, you'll want CANBUS LEDs. They're LEDs that have resistors in them so that the smart's computer doesn't panic at the low voltage. A BIG note for these is that the brake light bulb needs to have a repeater function, or else it would not work in your smart.
Also, failure to get CANBUS LEDs will lead to your turn signals hyperflashing. If you're okay with that, then you can get any LED you want.
- For your reverse lights and your parking lights, you can use any LED so long as they are the correct bulb number.
- For your dome light, that thing will take any LED as well. However unless you get a CANBUS LED in there, it will have a dim glow while turned off.
- For your fog lights, you can get any LED that fits, however if you want to see with them I would get a proper LED kit. Same goes for your low beams and high beams. Poorly designed bulbs won't work or won't last long here.
For your license plate lights, you can put any LED in those. However I've found that with my car, any non-CANBUS LED only lasts for a month or two before blowing. Meanwhile the CANBUS LEDs I have in there now have been working fine since 2014.
Here's what I bought for my 453's headlights. I've tested them to work absolutely gloriously, but I don't have them installed right now because I want to buy spare grommets to fit the heatsink and create custom venting.
Good luck! Send me a PM if you need any help.