Hi there,
Short answer: yes they do.
Long answer:
Dragons have an extra cone in their eyes that allows them to see much more of the lighting spectrum than humans can. The world to them likely looks much more vivid and different. If you can see the light being produced, they can see it, and most likely in a much more vivid and bright fashion.
So you definitely only want to use a CHE or a true IR bulb such as one Arcadia and megaray make.
66 isnt too bad really. I dont start worrying about supplemental heat unless temps drop below 60 (which they never do in my house) or if I have a sick dragon who would benefit from the immune boost that warmer night temps provide.
-Brandon