Hi William, LTA have certain regulations to follow when dealing with vehicles to ensure safety of the drivers and other road users. These regulations are put in place quite strictly so that road users don't abuse the lights on their cars and distract other road users.

More details can be found here: https://onemotoring.lta.gov.sg/content/onemotoring/home/owning/modification.html

I think still it is not logic, as a matter of fact, I'm enhancing safety to myself and to others, it's just a small light and so big thing where there thousands of cars with so many modifications n yet not check and not caught.