This is the most recent active thread for DRL, so the reason to reply here.
Bought a Leaf 2013 in the US many years ago and imported it to Canada this past week. While searching to figure out a good way to add DRL, I stumble a turn signal light bulb with a "Dual Mode". It does turn signal (yellow) and DRL (white) on the same bulb.
The way it works, when the turn signal is on the bulb switches between yellow and off. When the turn signal is off, the bulb is white.
For the white light to work as DRL, there's a separate wire that connects to the accessory power. To make that simple, "fuse tap cable".
I just ordered those, will post an update when I have time to install/try them.
What I find interesting is that it doesn't uses much power compared to the halogen headlight. Yes Yes, I'm trying to replace the H13 with LED but I can't make up my mind which brand/model to buy that will last years and not weeks/months. Even if I'd have LED headlights, I'm not sure I want to use them DRL, the turn signal are way cheaper to replace.