the tolerance for sunlight is not the worry, nor how they feel. it is the known physical effects of UV an DNA. {that is one of the main reasons i place items i clean in the full sun for a day (and rotate them) -viruses have DNA and sunlight damages DNA.}with out pigment to protect cells from genetic damage they are at higher risk. the humans with albinism suffer much skin damage from the sun. now their feathers will protect most the skin, and there may be a non melanin pigment in the legs which could provide some protection. it would be best for them to have plenty of shade as they wont know they are being damaged. with humans albinism is linked to poor eye, but for many reasons-see linkHaha! (college comment)
Having naked necks and even naked all over chickens, I get a fair amount of assumptions and "free advice" from other people. Like they need sunscreen, they cannot mate naturally, they cannot.. they need this or that........ No they don't need X and they do Y just fine... To be fair, I have made wrong assumptions before, so I tend to be a little skeptical and just test things out firsthand.
Hope they won;t be affected by UV and do allright outdoors to do chickeny things...
http://www.visionfortomorrow.org/albinisms-impact-on-vision/
now one other site focuses again on the physics of how eyes (like ours and chickens) work
"Decreased pigment in the iris (the part of the eye with color) and the retina leads to a diminished ability to absorb light. As light reflects off normal blood vessels in the back of the eye and through the pale iris, the effect is the red color sometimes seen in people with albinism. Insufficient iris pigmentation also causes people with albinism to be more light-sensitive and experience discomfort in bright light." (http://www.visionfortomorrow.org/albinism-faqs/) ...and almost every human albino have blue eyes (i met a girl with purple -meaning limited blue pigment covering up the red from the blood) but most animals that are albino (full not partial) are red.
now i know chickens are really resistant to gamma radiation but UV ?