LED's and your car / motorcycle

There is a fair amount of misinformation about LED's for automotive usage.
So far the only light that CAN NOT be replaced by LED's is the main/high beam of your front lights. This is mainly due to the beam pattern produced by LED's. That being said ALL of the other lights in your vehical can be replaced with LED's. But I hear you ask 'Why should I change to LED's?' and the answer is that because LED's use less power than normal bulbs, so there is more power left over for things like your sound system or even for the performance coil and ignition system. More power = bigger/better spark = more horse power out.
The main thing to make sure of when using LED's is that firstly they are able to work at 12volts (as standard most LED's work at about 2.5volts) and secondly they are bright enough. I personally use LED's with a power output of either 1watt or 3watts (and believe me these are BRIGHT) and I can make a rear light for a motorcycle with only 3 x 3watt LED's and still have it completly legal and MOT'able.
When replacing indicator bulbs to LED you will notice that the flash rate increases hugely or on cars some of them try and tell you that you have a blown bulb. This is because the power requirement is so low, it is now around 0.7-1.4amps rather than 3.5-6amps, so you need to either use a new indicator relay (about

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