I suppose the non xenon headlights did not come with the angel eyes as the DRL.
My Nissan Titan is the same way. My truck high beams are at low power with engine on, and act as DRL.
I'm not sure if there is an equivalent LED option to replace the halogen high beam bulb that would act at lower power for DRL, and increase intensity when the high beams are switched on.
But there maybe better options now, check amazon.
I think at one time it was bad to put an LED bulb in a reflective housing that was meant for halogens (gave glare to on-coming traffic), but perhaps LED manufacturers have improved the LED bulbs in recent years.
I have checked my truck bulb, (9005 or HB3) and there does appear to be LED replacements for these bulbs, but reviewers say that the high beams don't work as well.
For my truck, I ended up putting a Sylvania zXe bulb (halogen with the blue tint) in my low beam unit, and they work well giving that nicer 5000K light when just regular low beams are turned on.