Oh, you won't need 10amp.
Add bulb amps, choose well over that for cooler diodes. Likely not 2amp used, but 4amp is a nice size to work with imo. Check heat CAREFULLY after a few minutes to decide on saftey laying on plastic etc. Diodes get HOT and can burn your fingers.
Switches, I've never measured a draw on, but have used 4a myself. They aren't super active so stay really cool in general.