PantherVision has LED's installed under the hat brim, with two levels of illumination: reading or lighting up the trail.

They have fitted-hats and adjustable size "baseball hats" or running hats.

I started with this type of illumination, with the REI Trail Cap.

These hats use CR-2032 watch batteries.

I used to have headlamps. I never liked wearing a headband.

I pull my long hair thru the back of the adjustable hat. This works for me.

I would wear a hat anyway, so as far as I am concerned this is the ultimate in a lightweight headlamp.