Hi, I used accutane for the usual 6 month treatment. It worked great for me, I go to the tanning bed (now that im off the treatment) on a somewhat usual basis to keep my face dry and acne-free. The accutane has had no effect on how I tan and burn.
Once it has totally cleared your blood stream I'm pretty sure it doesn't continue to affect how you react to ultraviolet rays.
Hope this helps,