As some of you may noticed I am a bit of a geek. I have been thinking I need to have an electronics project. Mostly to have an excuse to buy a Raspberry PI. We a short while back I bought some 10w Amber LEDs, now I am thinking of a project to make my own set of amber flashy lights. I know at the end of the day the bought kits are going to be better and cheaper but I want to learn. I have since ruled out the PI for this task as the time to boot it would mean time that the lights are not working. So it looks like a Arduino which looks interesting. It is simpler and does what you ask it to do. Now I just need to learn about electronics and how to program a Arduino and all will be fine. Would like to have a programmable set of flash patterns which I can add to as time goes on. Big issue atm is working out the best way to drive the 10w LED lights. Which is 0.83A at 12V so I guess I would need to use a transistor to power this as a relay would just break down from the constant switching. Now how do you work out the transistor needed. Some of my friends have kindly suggested a Arduino UNO and to use MOSFETS so I am currently reading up on a handy tutorial from hobbytronics.co.uk on how to use the UNO to power high power items. The other option is to use a full size Arduino and a 'shield' designed for controlling motors etc., there are plenty around, often with screw terminals for connecting the power and loads.