Truthfully, my main objective is to overcome battery drain as I have a habit of leaving lights on, which becomes an issue in the lighter evenings...
I have LED in all lights now (I bought JohnV6 bulbs to put in my bikes, but then thought 'sod it' and chucked them in the Mog).
Prior to that I just had LEDs in front sidelights (four - I have retro fitted headlights with a pilot bulb), rear lights and dash illumination (all bar alternator, which needs a conventional bulb). On an overnighter on the way to Cornwall last year I left them on from about 4.00pm to 8.00am. In the morning there was still enough juice in the battery to start her up! With convential bulbs she would have been dead by early evening.
Have now fitted a 'buzzer' to tell me I've left them on!