Energy-Efficient Lighting: Bright Ideas for Your Home

Energy-efficient lighting produces the same useful light for less electricity, which lowers your power bill and reduces the heat your lights dump into the house. Lighting is rarely the biggest line on an Australian power bill, but it is one of the cheapest things to fix, and in a home still running halogens the difference is immediate. The Australian Government's energy information service sets out where household energy actually goes, if you want to see how lighting sits against everything else.

Here is what actually makes a difference, in the order worth doing it, and which parts need a licensed electrician for the lighting upgrade.

Judge lighting by lumens per watt, not watts

Wattage tells you what a light costs to run. Lumens tell you how much light it gives you. The number that matters is the ratio between them.

An old incandescent globe spends most of its energy producing heat rather than light. A halogen is a little better. An LED produces far more light per watt than either, runs cool, and lasts many times longer, which is why a like-for-like swap cuts the running cost of that fitting without changing how bright the room is. Where a product carries a label, the Australian and New Zealand energy rating label programme is the common basis for comparing efficiency claims.

Replace halogen downlights first

If your home has halogen downlights, that is where the savings are concentrated. A typical living area might carry six to ten of them, each drawing many times what an LED equivalent needs, and each producing enough heat that they must be kept clear of ceiling insulation.

Replacing them does three things at once. It cuts the running cost, it removes a heat source from the ceiling cavity, and, where the new fittings are insulation-contact rated, it lets the insulation be laid properly instead of being held back around every light. That last point often does more for your cooling bill than the lighting change does for your lighting bill.

This is licensed work. Changing a light fitting, its driver or its wiring is electrical installation work and needs an electrician.

Get the colour temperature right

Efficiency is wasted if the light is unpleasant enough that you add lamps to compensate. Warm white suits bedrooms and lounges. Neutral white suits kitchens, bathrooms and anywhere you need to see detail. Pick one temperature per open-plan area and stay with it, because a mix of warm and cool in a single sightline is what makes a room look poorly finished.

Dim properly, or not at all

Dimming genuinely reduces consumption, but LEDs and legacy dimmers do not get along. Older dimmers expect the substantial load of a halogen circuit, and when they see the tiny load of an LED they produce flicker, buzzing, a limited dimming range, or lights that will not switch off cleanly.

The answer is a trailing-edge dimmer matched to the LED drivers actually installed. Buying a dimmer on the assumption that it will suit whatever is in the ceiling is the usual reason people conclude, wrongly, that LEDs cannot be dimmed.

Use sensors and timers where lights get left on

The cheapest light is the one that is off. Motion sensors pay off in the places nobody thinks about on the way out: hallways, garages, laundries, robes, bathrooms and outdoor paths. Outdoors, a sensor also handles security lighting far better than a light left burning all night.

Timers suit anything on a predictable schedule, such as garden or facade lighting, and are worth pairing with a photocell so the schedule tracks the season rather than the clock.

Consider smart lighting for control, not for savings

Smart lighting lets you schedule, dim and group lights from a phone or a voice assistant. The saving comes from the control rather than the technology, so treat it as a convenience upgrade that can reduce waste, not as an efficiency measure in itself. If you go this way, favour a system where the switches still work normally when the network is down.

Layer the light instead of over-lighting the room

A single bright ceiling fitting forces you to light an entire room to the standard of the hardest task in it. Layering does the opposite: modest ambient light overall, then task lighting where the work happens, such as under-cabinet strips in a kitchen, a desk lamp in a study, or a bedside reader.

The result uses less total power and looks considerably better, because you are lighting surfaces people use rather than flooding the ceiling.

Use the daylight you already have

The Gold Coast has daylight to spare. Clean windows, light-coloured window coverings and pale wall finishes push natural light further into a room, and skylights or solar tubes reach rooms that windows cannot. It costs nothing to run and it is the one lighting improvement that also improves how a room feels.

Where lighting fits into a bigger energy picture

Lighting upgrades are the easy first step. If you are looking harder at your power bill, the larger levers are usually generation and load. Hot water is typically a much bigger energy user than lighting, which is why choosing between heat pump, solar and gas hot water matters more to most bills. Our guide to the benefits of solar power covers the generation side, and an older switchboard is worth checking at the same time, since lighting circuits are often the first place its limits show up. Flickering that follows an appliance starting, rather than a dimmer, is one of the signs your switchboard needs upgrading.

While you are having lighting work done, it is also a sensible time to run through the basics of electrical safety at home with your electrician.