Downlight installation and replacement on the Sunshine Coast: LED, IC ratings and what it costs

The ceiling full of halogens

A large share of the houses on the Sunshine Coast went up or were renovated between about 1998 and 2012, and the fashion of the day was a grid of 50 watt halogen downlights in every room. They looked sharp on the display home. Twenty years on, the same ceiling is the most common lighting job I get asked to quote, and the reasons are always the same three: the globes keep dying, the power bill, and somebody has read that halogens start fires.

All three are fair. A 50 watt halogen with its transformer draws around 55 to 60 watts and runs hot enough that the fitting has to be kept clear of the insulation around it, which is why older ceilings have a bald patch of insulation around every light and why the air conditioning works harder than it should. The transformers, now well past their design life, fail one at a time, which is why "the globe blew again" is so often not the globe. A modern sealed LED downlight draws 7 to 10 watts for the same light, runs cool, and, if you buy the right rating, can have the insulation put back over the top of it. This post is about doing that properly, what the ratings on the box mean, and what it should cost.

Replace the fitting, not just the globe

The first question everyone asks is whether they can just swap the halogen globe for an LED one and keep the fitting. Sometimes it physically works. It is rarely the right answer. Most halogen downlights are 12 volt MR16 lamps fed by a transformer in the roof, and a retrofit LED globe on an old iron-core or electronic transformer is the classic recipe for flicker, buzzing, early failure and a dimmer that will not dim. The least reliable part of the old install stays in the circuit, and you have spent money to keep it.

The upgrade worth paying for is a complete sealed LED fitting: the old fitting and its transformer come out, a new integrated LED downlight with its own driver goes in, and the insulation is made good around it. You get a product with a warranty measured in years, a fitting that can be covered by insulation if it is rated for that, and no transformer to fail. On a house with fifteen or twenty halogens, that is also where the running-cost saving actually shows up.

Most modern LED downlights connect with a short flex and a plug into a socket in the ceiling space. That detail matters in Queensland, because the law on who can do what turns on it. Installing the socket, running or altering cable, changing switches and dimmers, and removing hard-wired halogen fittings and transformers is electrical work and must be done by a licensed electrician. Unplugging one plug-base LED fitting and plugging in its replacement is specifically not electrical work under the Act. So the first conversion of a ceiling is a licensed job from end to end, and a like-for-like swap of a failed plug-base LED years later is something a homeowner may do, with one caution: turn the main switch off before anyone puts a hand into a roof space, and never do it alone.

IC, IC-F and the clearance rules

Every recessed light fitting sold here is classified under the recessed luminaire standard, AS/NZS 60598.2.2, according to how it may sit relative to ceiling insulation, and the classification is marked on the fitting and spelt out in the installation sheet. In plain terms the marks tell you one of three things: insulation may be laid over the top of the fitting; insulation may be pushed up against the sides but must not cover it; or the fitting must be kept clear of insulation and building materials by a set distance and belongs in a commercial ceiling, not a house. The ratings you will see on residential LED fittings are IC-F and IC, which are the coverable classes, and CA80 or CA135, which are the abut-only classes. IC-F fittings are also sealed so loose insulation cannot get inside them.

The reason it matters is the ceiling you already have. Almost every house on the Coast has insulation in the roof, and the point of converting to LED is to get that insulation back over the lights so the room stops leaking cooled air into the roof space. That only works if the fitting is rated to be covered, which is why I specify IC-F for insulated ceilings and would not fit an abut-only downlight in a bedroom to save a few dollars. The clearances themselves live in the Wiring Rules, AS/NZS 3000, at clause 4.5.2.3, which is also the clause Queensland's Electrical Safety Regulation requires anyone installing ceiling insulation to comply with. In other words, both trades are held to the same rule, which is how it should be.

One practical consequence: if you have loose-fill insulation rather than batts, say so when you ask for a quote. Loose fill migrates, it gets into unsealed fittings, and it makes a sealed IC-F fitting non-negotiable rather than merely preferable.

Colour temperature, dimmers and how many you need

Warm white, around 3000K, is what most people want in bedrooms, lounges and dining rooms; cool or natural white, 4000K and above, suits kitchens, bathrooms, laundries and garages where you want to see what you are doing. A lot of the fittings I install now are tri-colour, switchable between temperatures at the fitting, which means you can change your mind room by room without changing the light. If you are unsure, tri-colour is the safe choice.

Dimming is where cheap conversions go wrong. An old leading-edge dimmer designed for a halogen load driving an LED that wants a trailing-edge dimmer is the number one cause of the flicker I get called to fix on lights someone else installed. The fix is a dimmer that is rated for LED and a fitting that is rated to dim, matched to each other. If a quote does not mention the dimmers, it has not thought about them.

On count: fewer, better-placed fittings beat a grid every time. As a rule of thumb a bedroom needs four to six, a living room six to eight depending on size, and a kitchen needs light planned over the benches and the island rather than an even spread that puts your own shadow on the chopping board. Beam angle and spacing matter more than the raw number, and a like-for-like replacement of a bad 2005 layout is a chance to fix the layout, not just the fittings.

What it costs in Queensland

General Queensland market ranges, not a price list. For a straightforward like-for-like conversion, taking out a halogen fitting and its transformer and fitting a quality sealed IC-F LED downlight in its place, most electricians land somewhere between $80 and $150 per fitting supplied and installed when the job is done as a batch, with the per-fitting figure falling as the count rises, because the callout and the roof access are paid for once. A new downlight point, where there is no existing fitting and cable has to be run and a switch or dimmer added or altered, is more like $150 to $300 per point depending on access and how far the cable has to go.

Put together, a typical 2000s house with fifteen to twenty halogens converts for somewhere in the low thousands, and a full redesign with new points, LED dimmers and tri-colour fittings in the main living areas sits above that. Budget fittings will bring the number down and bring the electrician back in a couple of years; that is the one place I would not chase the lowest quote. If you want the general picture of what sits behind any electrician's number, callout, hourly rate, travel and materials, I wrote it up in what electricians charge per hour in QLD.

Against that, the running cost. Fifteen halogens at around 55 watts each with their transformers, on for four hours a night, is about 3.3 kilowatt-hours a day. The same fifteen as 9 watt LEDs is about half a kilowatt-hour. At current Queensland tariffs that difference pays for a mid-range conversion inside a few years on energy alone, before you count never buying another halogen globe, and before the air conditioning stops fighting the holes in the insulation.

What moves the price, and how to get an accurate quote

Access is the big one. A single-storey house with a walk-in roof space and batts is the easy end. A two-storey house where the downstairs ceiling is under a floor, a low-pitched roof with no room to move, a raked ceiling with no cavity at all, or loose-fill insulation that has to be cleared around every hole, all add time, and time is the price. Ceiling height matters too; a void or a stairwell needs a platform or a scaffold rather than a stepladder.

Then the existing wiring. Some 2000s installs looped every downlight off the one transformer; some have a transformer per light; some have the transformers buried in the insulation where they should never have been. What is up there decides whether it is a fitting swap or a rewire of the lighting circuit, and a photo cannot always tell us, which is why I would rather look than guess.

To get a firm price rather than a wide estimate, count the fittings room by room, note which rooms have dimmers, tell us the ceiling type and whether the roof space is accessible, mention loose-fill insulation if you have it, and say what you want the rooms to feel like at night. On the Sunshine Coast we do that as a $99 site inspection: we walk the house with you, count and check what is in the ceiling, plan the layout and the colour temperatures, and you get a written quote the same day, with the $99 credited back if you go ahead. Full detail on the work itself is on the LED lighting and downlights page.

This is bread-and-butter work for us across the 2000s estates in Sippy Downs, up the hill in Buderim and through Mountain Creek, where a whole street can share the same builder, the same halogen layout and the same failing transformers. If your ceiling is one of them, it is a good afternoon's work to put right.

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