Workshop lighting and WHS duties for Australian PCBUs

A workshop is where Australian WHS law stops being a poster in the tea room. People put hands near rotating things, climb into pits, and weld under a screen that already makes the world darker. Lighting that is “fine from the doorway” is how a PCBU discovers, after an incident, that nobody ever named the task.

This essay is a working method for workshop and task lighting under Australian work health and safety duties. It sits in the industrial and warehouse hub and next to the high-bay guide when the same shed holds a warehouse and a maintenance bay. The duty is to manage the risk, not to inherit a catalogue page.

What the PCBU actually has to do

Under the model Work Health and Safety Act — adopted, with local flavour, in most jurisdictions — a person conducting a business or undertaking must ensure, so far as is reasonably practicable, a safe working environment. Lighting is named in the regulations and in codes of practice. It is not optional fit-out. It is a control.

“Reasonably practicable” does not mean “we bought some batten LEDs.” It means you weighed the likelihood and degree of harm, what you knew or ought to have known, and the availability of suitable fittings. After a crushed finger on a poorly lit lathe, “the shed has always been like that” is not a defence. Safe Work Australia’s guidance, and the relevant code, will be read beside AS/NZS 1680 and your own risk assessment.

Western Australia and Victoria still speak a slightly different legal dialect. The practical duty is the same: identify the task, control the risk, maintain the control. Lighting that only works on day one, or only when someone remembers a portable flood, is not a maintained control. Write the duty into the specification — PCBU, tasks, standard edition, inspection interval. The standards hub is the rest of that paper trail.

Name the task, then the shadow

Workshops fail in shadow more often than they fail in average lux. A 400 lx mean on the slab can still leave a vice in the shade of the worker’s own shoulder, a pit in twilight, and an engine bay that is a cave once the bonnet is up. General high-bays, copied from the warehouse next door, light the floor between the benches and the top of the worker’s head.

Set working planes where the work is:

• Bench and vice: typically 0.8 m to 1.0 m, with light from both sides or from a large, low-brightness front so the worker is not their own shade.
• Machine bed and chuck: on the metal, not on the aisle. Vertical faces matter as much as the horizontal.
• Inspection and metrology: a step up in illuminance and colour quality.
• Pits and under-hoist: local task lighting, protected, so people are not climbing into glare.
• Welding bays: light the surrounds so the welder is not stepping from a cave into a flood.

AS/NZS 1680’s industrial tables are the briefing language. Use them as categories, then measure the real bench. A shop that rebuilds mining trucks in Kalgoorlie is not a school woodwork room in Geelong. Local task lights are not an admission of failure. What is a failure is a goose-neck the last apprentice took home.

Flicker, rotating machinery and the lie the eye believes

Stroboscopic lighting is a classic workshop hazard. A source that modulates with the mains, or with a cheap LED driver, can make a rotating chuck, a drill, a grinder or a woodworking cutter appear slower, stationary, or reversed. The machine is still at speed. The fingertip does not know that.

Bargain LED battens still do it, especially when they are dimmed or when a generator is feeding a dirty waveform. Specify drivers with documented low flicker (PstLM and SVM, not a marketing “flicker-free” badge). In a controlled test, look at a mark on the rotating part. If the mark walks or freezes, you have a WHS defect.

This is one reason workshop retrofits should not inherit the cheapest warehouse driver. The total cost of ownership conversation has to include the cost of a serious incident, not only kilowatt-hours. A bright, small source over a lathe also puts a highlight on oily metal that hides the edge. Use a larger, shielded source.

Colour, inspection and the night shift

4000 K remains the default in Australian trade workshops because it matches existing stock and does not make steel look theatrical. Inspection of coatings, wiring colour and print want a higher CRI and sometimes 5000 K. Do not mix temperatures down one bench run because two cartons were on special.

Night shift changes the brief. Daylight from a western roller door in a Townsville shed is a luminaire you do not control. After dark the same shed becomes a cave with a bright rectangle at the door. Provide a night scene that holds the benches. Absence detection should not punish someone standing still inside a machine guard.

Emergency lighting in a workshop is not a hotel corridor problem. People must leave past pits, gantries and a forklift that may still be in the aisle. Design it with industrial emergency and exit lighting, not with a single batten pack over the tea room.

Maintenance is part of the duty

A PCBU who installs good lighting and never cleans it has not finished. Failed lamps over a saw are a hazard, not a purchasing delay. Write a cleaning cycle, a fault-response time, and a rule that temporary floods are a recorded, time-limited control.

Our lighting audits and relamping notes are the field version of this paragraph. Record illuminance, flicker, shadow on the primary tasks, and whether the emergency test was done with the machines isolated. Portable 240 V worklights on a wet floor belong on the WHS risk register, not as a lifestyle. If the fixed lighting is right, portable gear becomes the exception you justify.

What to write in the specification and the WHS file

Steal this structure and then edit it for the shop you are actually running:

1. Name the PCBU, the site, and the WHS regulations that apply in that jurisdiction.
2. Name each visual task and the maintained illuminance on a stated plane — bench, machine bed, pit, inspection.
3. Name uniformity, shadow control, and a glare method that includes a person leaning over a vice.
4. Name flicker limits and a check on representative rotating machinery.
5. Name colour quality where inspection or wiring identification matters.
6. Name IP and IK for the real room: grinding dust, oil mist, hose-down, vehicle movement.
7. Name emergency and exit lighting as a separate system, tested.
8. Name maintenance, cleaning, fault response, and the ban on permanent “temporary” floods.

Require a mock-up on the noisiest bench, not only a calculation of the empty bay. Invite the leading hand. If they already own a head-torch, ask why before you approve the layout.

How we brief a real shop

On a recent 900 square metre Perth fabrication shop we refused a single high-bay grid. Weld bays sat on local, shielded task lighting. CNC cells sat on a low-flicker linear. The inspection bench sat on 5000 K, CRI 90. That brief was three pages. The SWMS could point to it.

The mistakes we keep seeing

Warehouse high-bays over benches and a proud average on the slab. Bargain LED battens on a lathe line. One 4000 K colour through an inspection room. A mezzanine office at 320 lx and a pit at 40 lx in the same PCBU. Treating flicker as an office-migraine topic.

WHS will not pick the fitting for you. It will ask, after the fact, whether you named the task and kept the control working. Light the hands, hide the source from the eye that has to do the work, and write the duty down before the incident writes it for you.