Hempy Buckets Solid Black or White/Blue/Orange Opaque Buckets?

Been wanting to try a Hempy bucket style for a while now. After scouring the net for info I've noticed that in almost every single picture/forum of a setup the buckets are white and or opaque. I would think the buckets would be black to not let any light in to the roots? Or are there white buckets out there that don't let any light in?

I can understand not wanting to use black buckets for Hempy buckets as you'd think that black would attract more heat from the HPS making the 2" rez at the bottom of each bucket too warm for the roots. Any thoughts or suggestions?

White on the outside, black on the inside. I had clear containers, but I wrapped them with mylar.