The Rosso twins are
Join Date: Oct 2011
Location: United Kingdom
County: Tyne and Wear
Got LED sidelight, interior and stop and tail lamp bulbs on my 147, been on for 2 years so far and no problems with them, they were not cheap though as they are all Canbus friendly and I purposely didn't get cheap ones as I wanted them to last.
As for the brightness of the sidelight bulbs, not sure why it would matter, as mentioned before you wouldnt drive at night with them on alone would you?