The number after the name or series of the tint is the VLT (Visible Light Transmitted) data.

Regardless of brand, madilim ang 5% VLT sa gabi. Kahit 20/20 pa vision mo. Dahil 5% visible light na lang ang pumapasok sa glass mo. How much worse kung umuulan pa? Super dilim na yan.

For safety at night, I recommend to use 30% VLT and up sa windshield and 15% VLT and up sa front windows. 5% VLT sa 2nd row and the rest is acceptable.

Of course, depende pa rin s'yo if you really want a darker tint.