UV umbrellas should be woven tighter to block out more sunlight, but even a non-UV umbrella will block a significant amount of sunlight.
I bought one of those UV-C detection cards that also detect UV-A and UV-B. Both a UV umbrella and a non-UV umbrella blunted the midday sun down from very high levels to low/medium levels.
I also bought a Japanese umbrella (brand Wpc) that is rated for UV and it blocks the UV levels down to zero.
alt Hacker News
UV umbrellas should be woven tighter to block out more sunlight, but even a non-UV umbrella will block a significant amount of sunlight.
I bought one of those UV-C detection cards that also detect UV-A and UV-B. Both a UV umbrella and a non-UV umbrella blunted the midday sun down from very high levels to low/medium levels.
I also bought a Japanese umbrella (brand Wpc) that is rated for UV and it blocks the UV levels down to zero.