Yes I'd found that Rene Furterer one too but it's KPF50, keratin protection factor which is just something I think they made up 🤷 but there probably isn't a standard measurement for hair SPF.
It is weird about the Apivita not being labelled SPF 30, I suspect that's why the other ones are hair and body, and the SPF can relate to the body.
I tried the Clarins, and whilst it's light and even gets rid of a few frizzies I really dislike the smell and it just comes and goes as your hair moves around. I was willing to ignore the alcohol (the topical medication I use for hairloss is also in alcohol and it's not really bothered me) and the silicone is the sunscreen so I don't think it's quite the same as a CG no silicone thing.
The Apivita only has Avobenzone in it, which just covers UVA rays and I really would prefer something broad spectrum (UVA just protects colour, UVB damage and protein loss). With the exception of Ultrasun they all have fragrance, but ultrasun is UVB only and loads of other silicones. Sigh.
I found one from Bioderma (broad spectrum, silicones and fragrance), Korff (Italian but I saw a lot of Greek pharmacies online selling it, broad spectrum, alcohol -but an aerosol so probably negligible as it evaporatea, silicones and fragrance), Decleor (but seems to be discontinued, or only available in Scandinavia
), and an alpha h one that looked interesting but not seen it for sale outside Australia. My local version of Superdrug also had something but the reviews were not encouraging.