Which SPF Number Should You Use?
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What Paula's Choice Customers Are Saying
This morning I used Paula's Cellular Defense Daily Moisturizer. It is as rich and thick as La Mer and is my new daytime moisturizer, at a fraction of the cost! -Carol
Daily Sun Protection Facts
UVA protection depends on the active ingredients in the product you are using. Be sure one or more of these active ingredients are included: avobenzone (sometimes listed as butyl methoxydibenzoylmethane), titanium dioxide, zinc oxide, Mexoryl (ecamsule) or, outside the U.S., Tinosorb.
There are several important factors that influence how you choose and should apply a sunscreen:
- How long you are going to be in the sun or sitting next to a window? (UVA radiation, the sun's most damaging rays, comes through windows.) The longer you are going to be in the sun or exposed to UVA radiation via windows the higher the SPF number you need to apply.
- Are you willing to apply your chosen sunscreen liberally? No matter what SPF rating you select, you have to apply it liberally. If you aren't applying sunscreen liberally, always go for a higher number to assure you are getting as much sunscreen ingredients on your skin as possible.
- Will you be swimming or perspiring heavily? If so, go for sunscreens labeled water resistant or very water resistant. Be sure to reapply as directed, especially after toweling off.
What's Your Rating?
Your ideal SPF number is a multiplication figure based on your skin color and the SPF number on the product. To determine yours, follow these easy steps:
Identify Your Skin Color:
 | Level 1 skin is very fair and often freckled. It burns easily within about 20 minutes of direct sun exposure and never tans. This is common for people with blue eyes and blonde or red hair. |  | Level 2 skin is fair to light and often burns with about 30 minutes of direct sun exposure. Tanning may occur but is minimal. This is common in people with blue, green, or hazel eyes and red, blonde, or light brown hair. |
 | Level 3 skin is light to medium or olive and sometime burns with about 40 minutes of direct sun exposure. Tanning is possible, but typically sunburn happens first. This level can apply to those of any hair or eye color. |  | Level 4 skin is medium to tan and rarely burns but can turn pink in about 60 to 90 minutes of direct sun exposure yet often tans easily. This is common for people with dark hair and eyes. |
 | Level 5 skin is brown to dark brown. It very rarely burns and tans easily in about two hours of sun exposure. Those with dark hair and eyes and of Middle Eastern or African-American descent are usually at this level. |  | Level 6 skin is black skin that never burns and always tans, though a tan is usually not apparent due to depth of natural skin color. |
Next, Do the Math:
- Your level of sunburn risk x the SPF rating = safe sun exposure for your skin color
- The SPF number is a rating that determines how long you can stay in the sun without burning when you wear a sunscreen without needing to reapply it. It does not indicate quality of protection, just length of time.
If you have:
- Level 1 skin (very fair) means you usually get a burn after 15 to 20 minutes of unprotected sun exposure. Determining your skin's response to various SPF ratings works like this:
- SPF 15 x 20 minutes = 300 minutes (5 hours) of protection
- SPF 30 x 20 minutes = 600 minutes (10 hours) of protection
- SPF 45 x 20 minutes = 900 minutes (15 hours) of protection
- Level 2 skin (fair to light) ) means you usually get a burn after 30 minutes of unprotected sun exposure. Determining your skin's response to various SPF ratings works like this:
- SPF 15 x 30 minutes = 450 minutes (7.5 hours) of protection
- SPF 30 x 30 minutes = 900 minutes (15 hours) of protection
- SPF 45 x 30 minutes = 1,350 minutes (22.5 hours) of protection
- Level 3 skin (light to medium/olive) means you usually get a burn after 40 minutes of unprotected sun exposure. Determining your skin's response to various SPF ratings works like this:
- SPF 15 x 40 minutes = 600 minutes (10 hours) of protection
- SPF 30 x 40 minutes = 1,200 minutes (20 hours) of protection
- SPF 45 x 40 minutes = 1,800 minutes (30 hours) of protection
- Level 4 skin (medium to tan) means you usually get a burn after 60 minutes of unprotected sun exposure. Determining your skin's response to various SPF ratings works like this:
- SPF 15 x 60 minutes = 900 minutes (15 hours) of protection
- SPF 30 x 60 minutes = 1,800 minutes (30 hours) of protection
- SPF 45 x 60 minutes = 2,700 minutes (45 hours) of protection
- Level 5 and Level 6 skin (brown to dark brown or black) means you usually get a burn after 120 minutes (2 hours) of unprotected sun exposure. Determining your skin's response to various SPF ratings works like this:
- SPF 15 x 120 minutes = 1.800 minutes (30 hours) of protection
- SPF 30 x 120 minutes = 3,600 minutes (60 hours) of protection
- SPF 45 x 120 minutes = 5,400 minutes (90 hours) of protection
Note that level 5 and level 6 skin should do just fine with a well-formulated sunscreen rated SPF 15. However, liberal application is still important. If you do not think you'll be applying the sunscreen as liberally as you should, consider a sunscreen rated SPF 30.