*LIGHT* Window Tint Film

Who knows something about window tinting film? I want to get my Volvo V70's
windows tinted to keep the interior cooler, but I want VERY light film. I
don't like the dark look. In fact, I want it to look almost like there is
no tint.

I saw somewhere that the light film blocks the same UV and almost the same
heat radiation. Can anyone confirm?

Does anyone know specifically what such film is called so that I can specify
when I call installers? Is it common? I tried to get super light film in
my last car, and it ended up looking like every other car.. too dark for
me.

I'm in the Dallas, TX area, if that means anything.

Thanks!