What’s the difference between SPF30 and SPF50?

The sunny climate brings beautiful weather; however, it also involves a high risk of skin damage, especially here in Australia–making SPF sunscreen protection essential for skin health. 

With so many options in the market, it can be confusing to choose the right product. One of the most common questions we hear is: “What’s the difference between SPF 30 and SPF 50?” well, in this blog, we’ll explore what SPF means, Its differences, and why both are vital for skin cancer prevention, help you make an informed choice about how to best protect your skin from harmful UV radiation.

What is SPF and Why It Matters

Sun Protection Factor (SPF) is basically a number that measures how much protection a sunscreen offers against UVB rays—those responsible for causing sunburn and contributing to skin cancer. 

For example, if you choose a sunscreen that has SPF 30, it should take 30 times longer for your skin to burn compared to if you weren’t wearing any sunscreen at all. However, SPF doesn’t measure protection from UVA rays (another harmful type of radiation). Hence, a broad-spectrum sunscreen is essential for complete sun protection.

According to the Cancer Council of Australia, almost 90% of non-melanoma skin cancers are associated with ultraviolet (UV) radiation exposure, highlighting the importance of daily sun protection for Australians. 

In addition to reducing the risk of skin cancer, regular use of sunscreen can help prevent premature aging from sun damage, including wrinkles, sagging, and age spots.

SPF 30 vs. SPF 50: What’s the Difference?

If we compare SPF 30 and SPF 50, the key difference lies in their ability to block UVB rays. 

SPF 30 blocks around 97% of  UVB radiation, while sunscreen SPF 50 offers slightly more protection, blocking about 98%. While the 1% difference might sound minimal, it can be significant over time, especially because Australia has some of the highest levels of UV radiation in the world.

Both SPF 30 and SPF 50 are a great sunscreen protection alternative. However, It’s important to note that no sunscreen offers 100% protection from UV rays, and the effectiveness of both SPF 30 and SPF 50 depends on proper application and regular reapplication. 

Regardless of which one you choose, pairing it with other protective measures like wearing hats and sunglasses will help minimise your risk.

Broad-Spectrum Sunscreen for Skin Cancer Protection

Broad-spectrum sunscreens protect your skin from both types of harmful UV rays. While SPF mainly measures protection against UVB rays, UVA rays penetrate deeper into the skin. They are the leading cause of premature aging, such as wrinkles and sunspots. Both UVA and UVB rays contribute to the development of skin cancer.

When choosing a sunscreen, always opt for one labelled “broad-spectrum” with an SPF of at least 30. This ensures your skin is properly shielded from harmful UV rays, providing comprehensive protection.

Lastly, don’t forget to use sunscreen daily—even on overcast days—as it can reduce your risk of developing skin cancer by 40-50%.

How to Apply Sunscreen Correctly

Using sunscreen is only effective if applied correctly. Here are some tips on how to protect from the sun and increase sunscreen effectiveness:

Choose the Right Sunscreen: 

• Select a broad-spectrum sunscreen with an SPF of 30 or higher
• Look for a water-resistant formula if you’ll be active or swimming
• Consider a tinted sunscreen with iron oxide for added protection against visible light

Apply Generously:

• Use about 1 ounce (a shot glass full) to cover your entire body
• Apply to all exposed skin, including often-missed areas like the lips, ears, around the eyes, and the neck and hands
• For the face and neck, use about 1/2 teaspoon

Apply Early and Often:

• Apply sunscreen 15-30 minutes before going outdoors to allow it to absorb into the skin
• Reapply every 2 hours, even on cloudy days
• Reapply after swimming, sweating, or towel drying

Use Proper Technique:

• Apply sunscreen in a thin, even layer
• Rub it in thoroughly
• For hard-to-reach areas, use a spray sunscreen or ask someone to help

Combine with Other Sun Protection:

• Wear protective clothing, a wide-brimmed hat, and sunglasses
• Seek shade whenever possible
• Reapply sunscreen liberally and frequently for the best protection

Myths About Sunscreen

Sunscreen has been around for decades, yet misconceptions persist. Let’s debunk some of the most common ones:

1. Sunscreen is Only Necessary in Summer: UV radiation can harm your skin year-round, even during cloudy or cooler months. Hence, it’s important to use sunscreen daily to protect yourself against UV exposure.

2. Once You Apply Sunscreen, You’re Protected All Day: Sunscreen must be reapplied every two hours for optimal protection. If you’re swimming or sweating, you’ll need to reapply even more frequently.

3. Makeup with SPF is Sufficient Protection: Always use a dedicated sunscreen in addition to your makeup; makeup with SPF can provide some level of protection, but it doesn’t really provide adequate coverage.

4. You Can’t Get Sunburned on Cloudy Days: Sunscreen should be worn daily, regardless of the weather. Up to 80% of UV rays can penetrate through clouds, so it’s still possible to get sunburned on an overcast day.

5. Sunscreen is Only for Fair Skin: While fair-skinned individuals may burn more easily, everyone, regardless of skin tone, is at risk of sun damage and skin cancer.  

Conclusion

Both SPF 30 and SPF 50 sunscreens offer strong protection against UVB rays, making them key allies in the fight against skin cancer. By using sunscreen correctly and regularly, you can significantly reduce your risk of skin damage and skin cancer.

At Manningham Skin Cancer Clinic, we encourage everyone to make sun safety a daily habit. Remember, skin cancer prevention is the best way to protect your skin. Book a preventative skin check today and ensure your skin remains healthy and safe.