Ya, I'd also like some more info on this.
Let's put it this way:
Scenario 1: Truck drives 60,000KM in daytime only = uses DRL's only.
Scenario 2: Truck drives 60,000KM at night only = uses low beams along with DRL's.
What would the difference on "wear" be?
The diode isn't increasing voltage or power, all it is doing is sending the signal for them to turn on.