I don't do it myself, (I'm Mediterranean and olive complected, with a weird pale Celtic color from my moms's side thrown in. Think of olive over white. Weird. I didn't even realize I had "light" skin until I was about 16 and the nearly full year tan finally wore off. My tan used to take forever to wear off. When I was kid, I still had tan lines from summer on my birthday, which is in late January. And, I would be dark until the next summer.
From what I have heard from the few friends who do it is the professional spray is the best. But, I'm going on hear say.
I haven't gotten a real tan since......I was about 16. I worked a a Baby Pool. And I was outside all day every day. I was going to tell the year, but I'm not going to.