Yeah, I hardly see anything under SPF15, which lets 1/15th of the light in (6.7%). I'd be interested in using an SPF 5 or so (1/5th or 20% of sunlight gets in).
Those are usually sold as tanning lotions instead of sunscreens.
But these usually contain chemicals that burn your skin to make them look brown? Like the oval office orangutan clown?
It's been a really long time since I've stopped to look at them, but not often. Those self-tanners are a different product. These would be products designed for tanning beds or getting tanned at the beach.