The Thalia OY40 is a 400mm round oyster with a teak wood finish 24W giving 1,575lm, withswitchable 3000K / 4000K / 6000K andthree-step dimming from the wall switch you already have.

This is the middle of three, and the useful comparison is with the500mm.

• 400mm 24W, 1,575lm, 1.5kg
• 500mm 36W, 2,790lm, 2.2kg

50% more power buys 77% more light so if the room can carry a 500mmdisc, the larger one is the better buy per lumen. The 400mm is the right choice when500mm would be too large for the ceiling: bedrooms, studies, hallways andsmaller living rooms.

1,575 lumens what that actually covers

Enough to be the only light in a bedroom, a study or a hallway, and enough for amodest living room. In a large open-plan space it will not carry the room alone that is what the 500mm is for.

At 66lm/W it sits between its two siblings (52 and 77.5). The Thalia is oneof only two ranges reviewed in this programme that getsmeaningfully more efficient as it gets bigger most givethe same output at every size.

It dims from an ordinary wall switch

No dimmer, no new wiring. Flick the switch off and straight back on:100%, 50%, 20%, then back to full.

In a bedroom that is the feature that matters most. A 1,575-lumen oyster at full istoo much last thing at night; at 20% it is a soft general light. Mostfittings need a dimmer and a spare wire in the wall to do that. This one needsthe switch already on your wall.

Three colour settings, reaching daylight

3000K, 4000K, 6000K, on a slide switch. Most switchable fittingshere stop at 4000K; 6000K is true daylight, which suits astudy or a craft room in a way warm white does not.

Choose it before the electrician leaves. Our recordflags the Thalia as colour changing, and that overstates it: the setting is madeonce, at the fitting, at installation, and is fixed afterwards not from aswitch, an app or a remote.

Round, and 60mm deep

1.5kg, 60mm from the ceiling a flat discrather than a bowl. The square Lyric OY40 is the identical light in a squarebody; the round forgives being a few degrees off centre where the square shows it.

IP20 indoor and dry locations only,ClassI earth required, inwood, polycarbonate and metal the metal was missing from ourrecord. CRI above 80. Not a bathroom; the Lunos squaresare IP44.

Where it works

• Bedrooms and the 20% step is why.
• Studies and craft rooms 6000K daylight.
• Hallways and smaller living rooms.
• Not a large open-plan room use the 500mm.
• IP20 not a bathroom.

Specifying it

400mm across, projection 60mm,1.5kg, in wood, polycarbonate and metal, teak wood tones.Integrated 24W LED giving 1,575lm, included, withslide-switch 3000K / 4000K / 6000K set at installation,CRI>80, andthree-step dimming from an ordinary wall switch 100% / 50% / 20%.240V, ClassI earth required,IP20 indoor and dry locations only. Warranty is three years, as a replacementwarranty.

Supplied and supported by Lights For You.

Questions

Should I get this or the 500mm?

If the ceiling can carry a 500mm disc, the larger one is the better buy per lumen 50% more power buys 77% more light. The 400mm is right when 500 would be too large: bedrooms, studies, hallways and smaller living rooms.

Will it light a room on its own?

A bedroom, study or hallway comfortably, and a modest living room. In a large open-plan space it will not carry the room alone that is what the 500mm is for.

Do I need a dimmer?

No. Flick your ordinary wall switch off and straight back on: 100%, 50%, 20%, then back to full. In a bedroom that is the feature that matters most 1,575 lumens at full is too much last thing at night, and most fittings need a dimmer and a spare wire in the wall to soften.

Can I change the colour temperature later?

No. Our record flags it as colour changing, which overstates it the setting is made once at the fitting during installation and is fixed afterwards, not from a switch, an app or a remote.

How is it different from the Lyric?

The Lyric OY40 is the identical light in a square body. Round forgives being a few degrees off centre; square aligns with the room and shows any misalignment.

What is 6000K for?

True daylight most switchable fittings here stop at 4000K. It suits a study or a craft room in a way warm white does not.

Can it go in a bathroom?

No IP20, indoor and dry locations only. The square Lunos oysters are IP44.