Do sunscreens protect equally against UV, regardless of SPF

I've been having lots of problems finding a non-oily sunscreen, and
have recently found Clinique's City Block SPF 15 to be very good.
However, i'm a red head with pale skin, so i'm wondering if i should be
using a higher sunblock.

I spend as little time in direct sunlight as i possibly can, and put
sunblock on first thing in teh morning when i get up. Do i still need a
higher sunscreen?

However, my main question is, is the UV protection in sunscreens all
equal, regardless of SPF? Since i spend so little time in the sun, my
main worry is UV, and, by using a SPF 15 am i getting enought
protection?

I'm presuming that an SPF of 15 means that it takes 15 times longer for
you skin to burn without sunscreen, so, as long as i dont spend too

Jamie...

This brings to mind a question that I have as a result of shopping today for
sunscreens today. When a product says it provides UVA/UVB protection - is
that 'broad spectrum'? Does that cover UVA1 and UVA2? Is it only broad
spectrum if it covers these two types of UV rays? Is this what the FDA is
haggling with sunscreen mfgrs over - labelling these appropriately? Most of
our sunscreens here in the US don't cover both UV's, right? If you know,
can you please explain yet again? Thank you.

much time in the sun i should be fine?

Cheryl :)