I think you would need a reflective type paint. Most whites are going to be great and if you get them glossy or in latex it will be easy to clean. Of course you will have to worry about scratching the paint and letting it dry of course.
California. I grow in a garage and it dips into the low 50 degrees fahrenheit (10 celsius) outside my garage and in my tent inside gets to about 60 degrees or 15ish celsius.