Time to sunburn

#1

Post by epiteton » Tue, Jun 15, 2021, 4:43 PM UTC

Re: Time to sunburn

#2

Post by janci5243 » Tue, Jun 15, 2021, 5:02 PM UTC

This might be completely a common knowledge, but I just learned recently that SPF (the number on most sunscreen products) is actually a multiplier of the time you can spend in the sun without any protection

So having an SPF of 50 increases a time 50 fold, which really puts things into perspective. Never leave the house around lunchtime without sunscreen.

Re: Time to sunburn

#3

Post by taeric » Tue, Jun 15, 2021, 5:03 PM UTC

Neat. Curious how to interpret this when you are tanned some. My understanding is that doesn't change your skin type, but you do build some resistance. That not the case?

Re: Time to sunburn

#4

Post by janci5243 » Tue, Jun 15, 2021, 5:07 PM UTC

taeric wrote: post #3

Neat. Curious how to interpret this when you are tanned some. My understanding is that doesn't change your skin type, but you do build some resistance. That not the case?

This article seems to say that getting a base tan helps to get 3-4 SPF, so your time-to-sunburn increases up to 4 times. https://www.health.harvard.edu/blog/problem-tanning-myth-bas...

I would not rely on it overall tough.

Re: Time to sunburn

#5

Post by Equiet » Tue, Jun 15, 2021, 5:08 PM UTC

There's a video which shows how you look like to a UV camera when you put sunscreen on. Also glasses with UV filters: https://www.youtube.com/watch?v=o9BqrSAHbTc

Re: Time to sunburn

#6

Post by qmmmur » Tue, Jun 15, 2021, 5:10 PM UTC

taeric wrote: post #3

Neat. Curious how to interpret this when you are tanned some. My understanding is that doesn't change your skin type, but you do build some resistance. That not the case?

You have a base level of resistance determined by your genes. When you get burned you tan and that burn is a function of time spent out in sun multipliednby that base protection. Tanning is our bodies response to the damage done by this as a form of preventing more damage. The damage however is accumulative.

Re: Time to sunburn

#7

Post by version_five » Tue, Jun 15, 2021, 5:10 PM UTC

taeric wrote: post #3

Neat. Curious how to interpret this when you are tanned some. My understanding is that doesn't change your skin type, but you do build some resistance. That not the case?

That was the first thing I wondered too. My skin is Type I or lighter going by the chart. But my neck and arms and face are much darker from a life spend outside. It says I can only go outside for seven minutes without sunscreen, which i believe if i was at the beach, but I know I can go outside much longer than that in a t-shirt without any burn.

Re: Time to sunburn

#8

Post by fouronnes3 » Tue, Jun 15, 2021, 5:11 PM UTC

Equiet wrote: post #5

There's a video which shows how you look like to a UV camera when you put sunscreen on. Also glasses with UV filters: https://www.youtube.com/watch?v=o9BqrSAHbTc

My ultimate dream is a pair of magical glasses with a small knob on it, which when turned adjusts the wavelength you can see from deep radio all the way to high energy gamma. Just imagine seeing the entire spectrum.

Re: Time to sunburn

#9

Post by BugsJustFindMe » Tue, Jun 15, 2021, 5:11 PM UTC

Getting GeocoderQuotaExceeded

Re: Time to sunburn

#10

Post by cryptoz » Tue, Jun 15, 2021, 5:12 PM UTC

Worth mentioning that UVA and UVB are different, and that there are multiple sunscreen scandals happening right now where UVA protection is insufficient. UVB causes burns and tanning but UVA causes more cancer; and American suncreens especially - but also globally - are not telling the truth about how much protection they offer.

You've got to be careful to really apply multiple layers of sunscreen with UVA protection in order to get the skin-cancer-reducing benefits. A thin layer does not do it. Thick layers required, and be warned, you sunscreen label may be lying to you about how much protection it offers.