The information in the manual of Renault are WRONG!
The reverse light is not PY21W but of course a very normal in clear glass and thus P21W. The Instructions are to follow. Please see image below.
Do LED ones work?
Yes but with mixed results. The Germans say they do not work as brake lights buts okay else where.
Not on the Twizy, but I’ve used a few different LED bulbs and they look good but many are just cheap Chinese rubbish and fail quickly.
If buying, I would avoid the cheap stuff and go for branded. If it is a hassle to fit the bulb, forget it as you will go through it again and again with aftermarket LED bulbs in my experience!
not knowing much about LED brands whitch ones are good to go for?