I have installed 2 sets of the new small ballast fully electronic/digital units on 2009 camry's
With the electronic/digital units, you do not get the massive start up requirement as in the regular ballasts.
Although they run at about a little less then 3 amps when warm they require upwards to 20 amps when starting/warming up, and this is why the relay kit would be required, when using the convential ballasts.
The digital units are about 3/8" thick and very easy to install, although the polarity wiring was reversed, no real big deal just reverse the connectors.
Here is where I bought mine.
http://cgi.ebay.com/ebaymotors/Super...7458QQtcZphoto