No, SPF 50 is not too strong for your face. In fact, it's often recommended for those who find SPF 30 ineffective. While SPF 50 offers stronger protection against UVB rays, blocking 98% compared to 99% for SPF 100, both effectively shield your skin from harmful sun damage.
The key is to use a sunscreen that is appropriate for your skin type and apply it generously and consistently. Remember, regardless of the SPF, sunscreen needs to be reapplied every two hours, especially after swimming or sweating.