Hi Raytay,
All vehicles must comply with vehicle standards under the
Road Transport (Vehicle Registration) Regulations 2007 (NSW). There are VERY detailed standards as to how vehicles are to look like and what they need to have. For headlights, requirements include: number of headlights, where they must be positioned, colour, nature, brightness etc. The standards are contained in
Schedule 2 to the regulations.
Non-compliance with the standards exposes the driver to penalties under
section 52.
To be clear, only specified vehicles (emergency vehicles) may have red and blue lights (one or both, flashing or not). See:
Vehicle standards information from the Roads and Maritime Services NSW.