What is SPF?
SPF stands for “Sun Protection Factor.” It’s a measure of how effectively a sunscreen product shields your skin from ultraviolet B (UVB) radiation.
How Does It Work?
The SPF number indicates the level of protection against UVB rays. For example:
SPF 15: If you apply an SPF 15 sunscreen, it would take 15 times longer for your skin to burn compared to not using any protection. In other words, it provides moderate protection against UVB rays.
SPF 30: If you apply an SPF 30 sunscreen, it will take 30 times as long for your skin to burn compared to not using any protection. In other words, it provides moderate protection against UVB rays.
Remember: that individual UV exposure thresholds vary based on factors like skin type and tone. Pale skin absorbs more UV light than dark skin and is more prone to burning. So, whether you’re fair-skinned or not, using at least SPF 30 during outdoor activities is a good practice for sun protection
SPF 50: If you apply an SPF 50 sunscreen, it will take 50 times as long for your skin to burn compared to not using any protection. In other words, it provides strong protection against UVB rays.
Remember: that individual UV exposure thresholds vary based on factors like skin type and tone. Pale skin absorbs more UV light than dark skin and is more prone to burning. So, whether you’re fair-skinned or not, using SPF 50 during outdoor activities is an excellent choice for robust sun protection
SPF only measures UVB protection, so choose a broad-spectrum sunscreen that also shields against ultraviolet A (UVA) rays.
What are the differences between UVA and UVB rays?
UVA Rays:
- Wavelength and Energy: UVA rays have longer wavelengths but lower energy levels compared to UVB rays.
- Penetration: They can penetrate deeper into the skin, reaching layers beneath the surface (including the dermis).
- Damage: UVA rays cause indirect damage to DNA and are associated with premature aging, visible effects like wrinkles, and some skin cancers.
- Source: About 95% of the UV rays that reach the ground are UVA rays. They’re also used in tanning beds and can go through windows and clouds.
UVB Rays:
- Wavelength and Energy: UVB rays have shorter wavelengths and higher energy levels than UVA rays.
- Damage: They directly damage the outermost layers of your skin.
- Effects: UVB rays cause sunburn, redness, blistering, and can contribute to premature aging and skin cancer.
- Source: UVB rays make up about 5% of the UV radiation reaching Earth and are partially absorbed by the ozone layer.
Remember: to protect your skin from both UVA and UVB rays by using broad-spectrum sunscreen and minimizing sun exposure