No.
SPF 30 lets in 1/30 of burning UV rays, while SPF 50 lets in 1/50. Adding the two together is pointless and would not result in high levels of skin protection.
To calculate the Sun Protection Factor (SPF) for sunscreen products, you divide the amount of time it takes for skin to burn without sunscreen by the amount of time it takes with sunscreen. For example, if it takes 10 minutes to burn without sunscreen and 150 minutes with sunscreen, the SPF would be 150/10 15.
500
Assuming the question is asking about sunscreen SPF, it stands for sun protection factor. This is put on sunscreen bottles to show the consumer how strong the sunscreen is.
The SPF number on a sunscreen label stands for Sun Protection Factor. This means if the SPF is 30, this means you can stay in the sun 30 times longer than you would be able to without wearing sunscreen.
dont try to make it lighter, use a sunscreen with good spf to protect it.
A million SPF
The SPF number in sunscreen indicates its level of protection against UVB rays, which cause sunburn. The higher the SPF number, the greater the protection. For example, SPF 30 blocks about 97 of UVB rays, while SPF 50 blocks about 98. This means that a higher SPF number offers more sun protection.
It does. The higher the SPF, the higher UV protection it contains. Let's say you have a sunscreen with a 30 SPF and one with 60, the one with 60 offers more protection.
It is proven that people with light skins, are best protected when using a SPF 50 sunscreen and upwards. Sunscreen has SPF ranging from 8, all the way up to 70. Depending on your skin tone, it is better to be too careful by protecting with a high number SPF.
If you are exercising, it would be best to use a sunscreen with an SPF of at least 30 and reapply at least every two hours or after sweating.
The highest SPF I have located is 110 for both Face and Body: Face: Neutrogena Age Shield Face - SPF 110 Body: Banana Boat Kids Max Protect & Play Continuous Spray Sunscreen SPF 110 Banana Boat Ultra Defense Sunscreen Lotion SPF 110 Banana Boat UltraMist Sport Performance Sunscreen SPF 110
4, 15, and 30 are good Sun Protection Factors for kids as they contain no "Bad Ingredients". SPF 50+ should not be used on young children. SPF 100+ can not be used on children under 13.