Looking for a good dedicated hairlight

[AaronChicago]

A 4' Quasar Science tube is great for this. You can use 2 small pieces of gaffer tape and attach it to a boom arm.

[Ben]

What about the small Came TV Boltzen lights? They have a basic fresnel lens and both run on NPF style batteries and you can get a magnetic modifier attachment with a little diffuser dome, etc.