Tint spray black-transparent for rear lights/blinker housing/windshield experiences?

Hi, would like to sound a little darker on my scooter, but you should also be able to see something of the light, so rather discreet. I would then join the panel, but it can then also be a little darker. If you need two different tint sprays, or then apply to the panel several times until the desired result has been achieved. What do you take best? Dupli-Color? Thank you and Gruss