Fluorescent tubes were the workhorse of Australian commercial lighting for decades. Walk into almost any older office, warehouse, school, or strata car park in Sydney and you will still find rows of T8s humming overhead. That era is ending. Replacement stock is getting harder to source, ballasts are failing, and the Minamata Convention has set a global phase-out date.
LED tube lights are the direct replacement. They drop into the same fittings, use roughly half the energy, last two to three times longer, and contain no mercury. The catch is that "drop in" is not always literal. The right approach depends on the existing fitting, the ballast type, and how much risk you want to carry into the next ten years. This guide walks through what Sydney commercial buyers need to know before placing an order.
Why the fluoro-to-LED swap is accelerating now
The pressure on fluorescent lighting is no longer just an energy story. Under amendments to the Minamata Convention agreed in 2023, linear fluorescent lamps are set for global phase-out by the end of 2027, with compact fluorescents discontinued by the end of 2026. Australia is a signatory. In practical terms, manufacturers are already winding down production, and getting your hands on replacement tubes for older formats is becoming painful in some categories.
Energy costs in NSW have moved in one direction over the past few years. Fluorescent lighting can account for a meaningful share of a commercial building's electricity bill, and most facility managers we speak to have already done the maths on whether to keep replacing tubes or move to LED.
LED tube light formats: T5, T8 and T12
The "T" number describes tube diameter in eighths of an inch.
- T8 tubes (25mm diameter) are the most common format in Australian commercial fluorescent fittings, usually 1200mm long. Most office, retail, warehouse and back-of-house fittings built between the 1980s and 2010s are T8.
- T5 tubes (16mm) appear in newer offices and slimline batten fittings. They run at a higher native output per length than T8, so the LED replacement spec is slightly different.
- T12 tubes (38mm) are the older 1.5-inch format. These are largely retired but still turn up in older industrial and back-of-house fittings.
When you specify an LED tube, the format has to match the fitting unless you are replacing the whole fitting. LED tubes are sold by length (typically 600mm, 1200mm or 1500mm), nominal wattage, lumen output, colour temperature, and ballast compatibility. Getting these wrong at the order stage is the most common avoidable mistake we see.
Plug-and-play, ballast bypass, or external driver
There are three ways an LED tube can be wired into an existing fluorescent fitting.
Type A (plug-and-play) keeps the existing ballast. The LED tube has internal electronics designed to be driven by the old ballast. Installation is quick, but the LED tube is only as reliable as the ballast it depends on. If the ballast fails, the tube goes with it, and the failure modes (buzz, flicker, short life) can be hard to diagnose later.
Type B (ballast bypass) removes the ballast from the circuit entirely. The LED tube wires directly to mains. It is the cleanest electrical outcome, gives the longest tube life, and avoids ballast-related flicker. It has to be done by a licensed electrician, and the fitting should be labelled so anyone working on it later does not assume there is still a ballast in the circuit.
Type C uses an external LED driver in place of the ballast. Less common, generally specified where a building is standardising on a particular driver platform across all retrofits.
For most commercial Sydney retrofits, ballast bypass is the default approach. The labour cost is small relative to the total job and it removes a failure point you do not want hanging over a five to ten year LED installation.
Choosing LED fluorescent lights for your space
Once the format and wiring approach are settled, the spec questions are the same as any LED specification: lumens, colour temperature, CRI, and diffuser type.
Lumens, not watts. A 36W T8 fluorescent puts out around 2,800 to 3,400 lumens depending on age. A modern LED tube replacement reaches the same output at 18 to 22 watts. Spec on lumens, not on wattage, and make sure the comparison is being made against the fluorescent tube when new, not against the tired, dimmed tube currently in the fitting.
Colour temperature. Most office and back-of-house spaces run at 4000K. Warehouses sometimes go higher (5000K) for visibility on shelving and forklift paths. Retail and hospitality often want 3000K for warmth. For more on this, see our colour temperature guide for commercial spaces.
CRI 80 minimum, CRI 90 where colour matters. Standard offices and warehouses are fine at CRI 80. Retail, galleries, dental practices and any space where colour judgement matters should be specified at CRI 90 or above.
Glare and diffuser quality. A cheap LED tube with a clear diffuser sitting in an old fluorescent housing can be uncomfortably bright at desk level. Frosted or opal diffusers are usually the better call in occupied office spaces.
When to replace the whole fluorescent fitting
Sometimes the right move is not a tube swap. Choosing LED lights to replace fluorescent lights at the fitting level makes more sense when:
- The fitting housing is corroded, water-damaged, or insect-infested
- The diffuser is yellowed and reflectance has dropped
- The fitting layout no longer suits the space (often after office or warehouse fit-outs have moved walls or racking)
- The original spacing produces uneven light levels that no tube swap will fix
- The site is going for a NABERS or Green Star rating that prefers a modern fitting with integrated controls
For those projects, LED panels suit office and retail ceilings, LED battens suit warehouses, back-of-house and car parks, and high bays suit anything above about 5 metres. Our office and industrial product ranges cover the common fitting types.
Compliance, ballast bypass and the electrical work
Bypassing a ballast is electrical work. It has to be done by a licensed electrician, and the work needs to comply with AS/NZS 3000 (the Wiring Rules). The fitting should be labelled to indicate it has been modified for direct mains LED operation, so future maintenance does not put a fluorescent tube back into a fitting that no longer has a ballast.
For interior commercial spaces, the lit environment also needs to satisfy AS/NZS 1680 lux level requirements. A tube-for-tube swap usually preserves the existing geometry, but if the LED replacement is significantly brighter or dimmer than the original fluorescent, the lux levels will shift and may need to be re-measured.
If a site is also installing or upgrading emergency lighting at the same time, AS/NZS 2293 governs that work and is typically a separate scope from the tube swap itself.
Energy, maintenance and the cost case
Energy use drops in two directions. The tubes themselves draw less power, and the ballast (where bypassed) draws no standby load. Across a warehouse running 12 to 16 hours a day, the lighting bill change is usually the headline number.
Maintenance is the quieter saving. Quality LED tubes are rated at 50,000 hours or more, against the 15,000 to 30,000 hour life of typical fluorescent tubes. In a multi-storey site, every lamp change avoided is also an avoided EWP hire, scaffold movement, or after-hours access call-out. For more on the financial picture, our energy savings guide walks through where the numbers tend to land.
In NSW, some tube and fitting retrofits qualify for incentives under the Energy Savings Scheme. Eligibility depends on the existing fitting, the LED product chosen, and how the project is documented, so it is worth checking before the order is placed rather than after.
How to plan a fluorescent to LED tube replacement
The order we usually work in for a Sydney site:
- Audit the existing fittings: count, format (T5, T8, T12), length, ballast type, and fitting condition.
- Measure lux levels and check against AS/NZS 1680 for the space type.
- Decide tube swap versus full fitting replacement on a zone-by-zone basis.
- Specify the LED tube or fitting: lumens, CCT, CRI, dimming or DALI compatibility where relevant. Our DALI controls explainer covers when control integration is worth the extra spend.
- Plan the install around occupancy: night shifts and weekends for office floors, between-shift windows for warehouses.
- Check ESS eligibility and other incentives before locking in the spec.
- Install, commission, and label any fittings where the ballast has been bypassed.
The audit step is where most of the avoidable mistakes get caught. Ordering 1200mm T8 LED tubes for a site that turns out to be a mix of 1200mm T8 and 1500mm T8 is a frustrating way to start a job.
Get in touch to discuss a fluorescent to LED retrofit. We will start with a site audit and a written specification before any product is ordered.