Buying guide

LED downlights buying guide: sizes, colours, dimming and how many you need

By the Greenhse Technologies team, Ellenbrook, Perth. Updated 13 November 2026.

Quick answer

Start with the cut out, the size of the hole in the ceiling. 90mm is the Australian standard and has the widest range. Then choose a tri colour model so you can set warm, natural or bright white on the fitting, check it is dimmable if you need that, and use low glare downlights in living areas. Greenhse 90mm LED downlights started at $9.90 inc GST on 13 November 2026.

Cut out sizes in stock: 70mm, 90mm and 110mm, plus large 140mm to 230mm commercial downlights.
Most are tri colour: 3000K warm white, 4000K natural white or 5000K bright white, set by a switch on the fitting.
Most are dimmable on standard trailing edge dimmers. The product page says which.
Smart downlights change colour and dim from your phone, Amazon Alexa or Google Home.

Step 1: measure the cut out

If you are swapping old halogen downlights, measure the hole you already have, edge to edge, and buy that size. For a new build or renovation, 90mm is the standard choice. 70mm gives a smaller, neater look, and 110mm covers larger existing holes.

Step 2: choose the colour of the light

Warm white (3000K) suits bedrooms and living areas. Natural white (4000K) and bright white (5000K) suit kitchens, laundries, bathrooms and work spaces. With a tri colour downlight you do not have to decide in the shop. Your electrician sets the switch on each fitting, and it can be changed later.

Step 3: pick the type

Standard flat downlights: the everyday choice for general lighting, with a wide 100 to 110 degree beam.
Low glare downlights: the LED sits back behind a recessed lens, so you see the light on the room and not a bright dot in the ceiling. Best for living areas and kitchens.
Gimbal downlights: the head tilts to aim light at a wall, bench or artwork. The IP65 gimbal models are sealed for bathrooms and eaves.
Smart downlights: full colour or adjustable white, controlled through the Smart Life app.
Large downlights (140mm to 230mm, 20W to 40W): for shops, offices and high ceilings.

Step 4: work out how many

As a rough guide for a standard 2.4m ceiling, downlights are spaced about 1.2m to 1.5m apart and about half that distance from the walls. Kitchens and work areas need more light than bedrooms and hallways.

For an exact answer, use the Downlight Finder on the downlights page, or upload your floor plan to the free Lighting Layout app for three priced lighting plans.

Step 5: dimming and installation

If you want to dim the lights, check the product page says dimmable and have your electrician confirm your dimmer is compatible before you buy. In Western Australia all 240V lighting must be installed by a licensed electrician.

Products in this guide

Prices are read from the shop each time the site is updated. Every price is in Australian dollars.

Questions and answers

What is the most common downlight size in Australia?

90mm. It is the Australian standard cut out and has the widest range of fittings.

How much do LED downlights cost?

On 13 November 2026 Greenhse 90mm LED downlights started at $9.00 ex GST ($9.90 inc GST) for the 8W high lumen tri colour model. Check the product pages for today's price.

What is a tri colour downlight?

A downlight with a switch on the fitting that sets the light to 3000K warm white, 4000K natural white or 5000K bright white.

Can LED downlights go in a bathroom or under eaves?

Yes, with the right IP rating. Choose an IP65 downlight, such as the 90mm 10W gimbal or the 70mm 7W black gimbal, for wet or exposed spots.

Does Greenhse deliver downlights outside Perth?

Yes. Delivery covers the Perth metro area and freight outside Perth is quoted. Greenhse ships within Australia only.

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Need a hand choosing?

Talk to the Greenhse team in Perth. Call (08) 9297 2969, email sales@greenhse.com.au or visit the showroom at 5/1 Locke Ln, Ellenbrook WA 6069. Open Monday to Friday 8:30am to 5pm and Saturday 9am to 2pm.

Contact and find us Plan it in the Lighting Layout app