Recessed Downlight SLV NUMINOS DL M White/Chrome 17.55W 4000K 1003906

The NUMINOS DL M is a round recessed downlight from SLV: a matt white ring 10.5 cm across with a mirrored chrome reflector inside it. The LED source is built in permanently, and the body ends in a finned aluminium heat sink, visible only from the ceiling void.

What cut-out it needs and how much space above the ceiling

The cut-out is round and 9 cm across, and the installation depth is 7.5 cm — that much clear space has to sit above the plasterboard. Check for ducting or insulation up there before cutting.

The ring itself measures 10.5 cm and covers the edge of the cut-out, projecting only 0.7 cm below the ceiling — the rest of the 6.8 cm total height disappears into the void. Leaf springs clamp it against the board, so no extra screws are needed.

How much light it gives and of what kind

The luminaire puts out 1660 lm, about what two old 60 W bulbs gave. The 4000 K colour is neutral white — light without a yellow cast, closer to daylight than the domestic 2700 K, and even across a row of fittings.

Colour rendering reaches Ra 90, so colours look true under it — which counts at a kitchen worktop or anywhere shades are judged. The manufacturer also states UGR 19 or below — the threshold the office-lighting standard asks for, so a screen worker under it should not be dazzled.

The 40-degree beam throws a directed cone rather than filling the room. The LED module cannot be replaced; SLV rates it L80B50 at 50,000 hours — after that, half the fittings in a batch still hold at least 80% of their starting output.

What has to be bought alongside it

The fitting runs at protection class III on a 500 mA constant current and has no built-in driver — the LED driver is bought separately and sets whether the light dims. SLV names a 20 W 500 mA phase-cut driver (art. 1004054), a 29 W 500 mA DALI version (1004069) and a 42 W bridge driver with a radio interface (1006459).

The NUMINOS M range also has push-on diffusers — frosted, prismatic and honeycomb — and 160/100 mm reduction rings for a ceiling already holed. The manufacturer rates it IP20/IP44 and IK02, allows an ambient range of -20 to 40 °C, and gives a 5-year warranty.