For Headlight:
According to Hong Kong Transportation Department, Colour of headlamp beams must be white or yellow.
DO NOT replace the original filament bulb with filament bulb of higher ratings or light sources such as LED or HID light tube
For Side Lamps, Stop Lamps & Indicators :
If you wish to replace your filament lamps (side lamps, stop lamps and direction indicators) with lamps of LED light source, choose only those that have been approved by TD or have an ECE approved marking inscribed on them, and are constructed to fit your vehicle
DO NOT: Fit LED lamp not approved by TD; or has no ECE approved marking inscribed on the LED lamp; Install lamps not constructed to fit your vehicle
For Fog Lamps:
If fog lamp is to be fitted on vehicles, they must be filament lamps bearing with ECE approved marking; Colour of front fog lamp beam must be while or yellow while colour of rear fog lamp must be red; Front left and right fog lamps shall be installed not more than 400 mm from the sides of the vehicle with their height less than the height of the headlamps; Shall be at least 250 mm above the ground
DO NOT : For private car and light goods vehicle, height of front fog lamp from the ground is more than 800 mm; For other vehicles, height of front fog lamp from the ground is more than 1,200 mm; Fog lamps will light up automatically if headlamps are switched on
source: https://www.td.gov.hk/filemanager/en/content_4808/dondont.pdf
