I installed LED H4 replacements a few months ago. Specifically, these by Beamtech:
FWIW, exactly the same LED units seem to be sold under a few different names. If you want to pay more and have a different logo, they're also sold by SuperbrightLEDs.com:
Here's why I didn't go with HID H4 replacements:
-Vee's headlamp housings aren't designed for HIDs. Likely results included: improper focus, beam formation, and blinding other drivers.
-additional wiring required for the ballast/power supply.
-lower efficiency vs LED = lower power savings and more heat
-possibly lower reliability (most sources seem to indicate fewer hours between failures for HIDs, where LEDs basically last forever)
-faster decline of output w/age vs. LED.
I have a 2007 Vee, but I believe the 2012-2016 DL650 also uses H4 bulbs. So the Beamtech H4 LEDs should work for you as well. I installed mine a few months ago, and have been very happy. Power savings are one benefit of course. I can now run heated jacket liner + heated gloves at full blast & still not discharge the battery at idle.
Not sure whether it's an actual increase in brightness, change in color temp, or combination of factors, but I found that nighttime visibility was also improved. I could see farther ahead, and more to the sides, vs. halogens. I compared by taking photos with both stock halogens & LEDs, under the same lighting conditions in the same place.
One small drawback: The beam pattern is not quite as sharp with the LEDs vs. halogens. In particular, upper beam cutoff is less crisp. But, this hasn't caused a problem yet.
The Beamtech LEDs have neither a fan nor strip-type heat sink. Rather, the heat sink is built into the base (that's the grooves/fins you see). I've touched them in operation, but they don't get more than "warm."