Hi Robelle! Kindly refer to this guideline for vehicle modifications that requires LTA approval: https://onemotoring.lta.gov.sg/content/onemotoring/home/owning/modification.html

You may refer to this link for further details: https://www.motorist.sg/ask-motorists/446/are-after-market-light-bulbs-legal-to-be-used-for-vehicles