With SPF 50, 2% of UV rays are able to penetrate the skin. That's how you're still able to get a tan even with a high SPF. So in order to prevent yourself from sun damage, you need to reapply at least every two hours.
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Higher SPF sunscreens contains higher concentrations of chemical sunscreen ingredients. It is scientifically shown that chemical (organic) sunscreen ingredients can be absorbed into the skin, and when struck by UV radiation, these can become quite aggressive free radicals, increasing the risk of damage.
SPF 30 blocks about 97% of UVB rays, while SPF 50 blocks about 98% of UVB rays. This means that SPF 50 provides slightly higher protection against UVB radiation compared to SPF 30. However, it's important to note that the difference in protection between SPF 30 and SPF 50 is minimal.