Direct answer
Lighting modifications are legal when every lamp on the vehicle still complies with the Australian Design Rules and the in-service lighting rules that apply to that vehicle — colour, number, position, aim and photometric type included. Adding a lamp is legal only when the extra device itself complies and is switched and aimed the way your state information sheet describes. Converting a halogen housing to a different source type is the job that most often fails, because the housing was certified as a system.
Read the ADR index and your state lighting sheet. We will not invent a lux, candela or colour-temperature number.
Lamps are certified as systems
A headlamp is a housing, a source, a lens and an aim method. The ADR treats that as a package. Changing one piece can take the package outside the rule it was certified to. That is why “plug-and-play HID” and untagged LED emitters inside a reflector designed for a filament are a predictable defect: glare, colour and the cutoff no longer match the type.
The conservative path is a complete lamp assembly that carries the marking your agency expects, fitted and aimed to the published method. If a seller cannot tell you which ADR the assembly is offered under, you do not have enough information to fit it.
What a state sheet adds
Transport Victoria lists additional forward and rearward facing lamps as approved modifications only when they comply with the standards for registration. It also points at separate information on flashing lights, other lights and reflectors, and on equipment in the driver’s field of view — including reflective film. Other agencies publish equivalent sheets. Those sheets are where switching (when a driving lamp may be on), colour, and mount height live. Read them for the vehicle class you actually have.
TfNSW, TMR Queensland and the remaining pages on the state map are the starting points if you are not in Victoria.
Covers, tints and painted lenses
Headlight covers and tinted tail-lamp films change the marked optical area. Several archived product URLs on this domain sold covers. They now 301 to the audio and lighting hub. A cover that the state treats as reducing the lamp’s compliance is not a styling footnote. If you cannot show that the lamp still meets the standard with the cover fitted, do not fit the cover.
Driving lamps, light bars and work lamps
Extra forward lamps are a frequent 4WD and touring modification. They are also a frequent defect when they sit too high, dazzle oncoming traffic, lack a dedicated switch, or stay on with the daytime running lamps. The state sheet, not a bull-bar brochure, decides when they may be used on a public road. Aim them on a marked wall using the method the sheet describes. We will not invent a wattage cap.
Rear and side devices
Aftermarket tail-lamps, sequential indicators and side markers have the same system logic as headlamps. Colour and function have to remain those the ADR and AVSR describe. A smoked housing that leaves the stop lamp anaemic at night is a safety defect even if it photographs well.
Electrical load
LED assemblies often draw less current; some conversions draw more or confuse a monitoring circuit. If the vehicle uses lamp-circuit monitoring, a conversion can trigger warnings or leave you without a fail-safe. That is an electrical compliance question as well as an optical one. Ask the person who would certify the job.
Related pages
Check with your state regulator before you convert a lamp. This guide is not an ADR approval.
Aim, the unglamorous half of a lamp job
A compliant assembly aimed at an oncoming driver’s mirrors is still a defect in the only sense that matters on the road. Use the wall method your state sheet or ADR pathway describes. Re-aim after a height change. Re-aim after a bull-bar or winch job that moved the lamp. Write the aim date on the invoice.
If you cannot find the method, ask the agency. Do not invent a “two inches below the mark” rule from memory.
Motorcycles, trailers and why this guide stays with light cars
This site is about light motor vehicles in the VSB 14 sense. Motorcycles and trailers have their own lighting rules and, for small trailers, their own bulletin. Do not apply this page to a bike or a box trailer and assume the same assembly is lawful.
Electrical checks after a conversion
Confirm that high beam, low beam, flash-to-pass, daytime running lamps and any monitoring circuit still behave. Confirm that a failure of one lamp does not kill its pair if the original system isolated them. Confirm that added driving lamps cannot be on when the sheet says they must not. Then take the car into the night on a quiet road and look at the cutoff on a wall or a safe marked surface — not into other people’s eyes.
Related
Audio and lighting, legal modifications. Check with your state regulator before you convert a lamp.
Markings worth photographing
Photograph the E-mark or the equivalent marking on the assembly you intend to fit, and photograph the marking on the assembly you remove. Those two photographs are how you show a later person that you fitted a lamp, not a toy. If there is no marking, you do not have enough information.
Keep the aim photograph too — the wall, the marks, the date. Lighting jobs fail months later when someone argues about glare and nobody can show how the lamp was set.
Covers, films and the optical area
If a cover or a tinted film changes the optical area, treat it as part of the lamp. The archived cover SKUs on this domain 301 to the lighting hub because that is the honest topic. A cover that only exists to make a lamp look smoked is usually a compliance argument waiting to happen.
Check with your state regulator before you convert a lamp.
Daytime running lamps and conversions
Some conversions confuse a DRL circuit or leave a lamp in a mode the ADR pathway did not describe. After the job, cycle ignition, lights and high beam in daylight and after dark. If a DRL stays on with a driving lamp in a way the sheet forbids, you are not finished.
Trailers you tow have their own lighting. A conversion on the car that starves a trailer socket is a different defect. Check the socket after any electrical work in the tail.
Emergency and flashing devices
Flashing lamps are a tightly controlled topic. State information sheets — Victoria’s flashing-lights sheet is one public example — decide who may show what colour. This guide will not sketch a DIY bull-bar beacon for a private car. If your work is not on an authorised vehicle, assume a flashing beacon is a problem until the sheet says otherwise.
Interior lighting and driver vision
Cabin lighting that washes the windscreen at night is a vision problem. It is not always an ADR headlamp problem, but it is how people fail to see a pedestrian. Keep show lighting for show. On the road, the lamps that matter face out and aim down.
Related: audio and lighting. Check with your state regulator before you convert a lamp or add a forward device. This guide is not an ADR approval.
Closing checklist
Photograph the markings on the assembly you removed and the one you fitted. Aim to the published method and date the photograph. Cycle DRL, low, high and any added driving lamps against the state sheet. Confirm trailer sockets if you tow. Confirm no cover has reduced the optical area you cannot defend.
Check with your state regulator before you convert a lamp.
Why “LED is legal” is the wrong sentence
Some LED assemblies are offered as complete lamps with markings. Some LED emitters are offered as bulbs for housings that were never certified with them. Those are different products. The first can be a pathway if the assembly meets the rule and is aimed. The second is the conversion this guide keeps warning about. Speak in assemblies and markings, not in the word LED.
The same split exists for HID. A complete marked assembly is one conversation. A capsule in a halogen reflector is another. Marketing will try to collapse the split. Inspectors will not.
Check with your state regulator before you convert a lamp. Photograph markings and aim. Re-aim after any later height change so the lighting job and the suspension job stay one vehicle.
One more walk-around
At night, on a safe marked surface, look at the cutoff. In daylight, look at the markings you photographed. On the switch, confirm driving lamps cannot sit in a forbidden mode. If any of those three checks fails, you are not ready for an inspector. Check with your state regulator before you convert a lamp.