Auster 225mm slim oyster light dimmable, five colour temperatures

A slim round oyster in white polycarbonate, 225mm and only 53mm deep. It is a surface-mounted ceiling fitting for a bedroom, hallway, laundry or small living space the shallow depth is what keeps it from reading as a bulky dome on a standard ceiling.

It fits over an existing downlight hole

The Auster accepts a cutout anywhere from 60mm to 205mm. That range is the practical reason to choose it: it will cover an existing downlight aperture, an old oyster’s fixing holes, or a patched hole left by a previous fitting, without any plaster repair.

On a renovation that is worth a great deal. Replacing ceiling fittings normally means either matching the old cutout exactly or patching, sanding and repainting the ceiling. A fitting that spans anything up to 205mm removes that entirely.

Five colour temperatures, each with its own output

This is a five-step fitting rather than the usual three: 2700K, 3000K, 3500K, 4000K and 5000K, selected on the fitting at installation. Output is rated per step 1210lm at 2700K, 1285lm at 3000K, 1350lm at 3500K, 1375lm at 4000K and 1330lm at 5000K from an 18W draw.

Five steps with a 3500K in the middle is unusually fine control. 2700K suits a bedroom, 3000K a living area, 3500K is the setting people reach for when 3000K feels too yellow and 4000K too clinical, and the cooler steps suit a laundry or a workspace. Colour rendering is above 80 CRI.

Triac dimmable

The Auster is Triac dimmable and works with a conventional LED-rated wall dimmer, with no additional module on the circuit. On a bedroom or hallway oyster that matters more than the top-end output does most of the time the fitting will be run well below full.

Power and installation

It runs on 240V and is a Class 2 fitting, so no earth is required at the fitting. It is rated IP44 for splashing water, which allows it in a bathroom outside the immediate shower zone confirm the zone requirements with your electrician rather than assuming from the rating.

It is rated IK04 for impact and the LED is built in, so there is no globe to buy or replace. Installation is work for a licensed electrician.

Frequently asked questions

Will it cover my old downlight hole?

Almost certainly. It accepts a cutout from 60mm up to 205mm, so it spans most existing apertures without patching.

How many colour settings does it have?

Five 2700K, 3000K, 3500K, 4000K and 5000K each with its own rated output.

Can it be dimmed?

Yes. It is Triac dimmable and works with a conventional LED-rated wall dimmer.

Does it need an earth?

No. It is a Class 2 fitting.

Can it go in a bathroom?

It is rated IP44. Confirm the bathroom zone requirements with your electrician.