Ljuset

LK‑9.

One module across the whole range. Nine watts, 806 lumens, Ra 97, and it dims to 1800 kelvin instead of going grey. Two screws and a PH1 to change it, and we will sell you one in twenty years.

LK‑9
Effekt	9 W
Ljusflöde	806 lm
Ljusutbyte	89.5 lm/W
Färgtemperatur	2700 K nominell
Dim-to-warm	2700 → 1800 K
Färgåtergivning	Ra 97, R9 ≥ 90
Flimmer	< 1 % vid full effekt
Livslängd	25 000 h till L80B10
Sockel	E27, eller integrerad
Dimning	Fasdimning; DALI i projektversionen
Skyddsklass	Klass II, dubbelisolerad
Kapsling	IP20 (IP44 i SKYMNING)
Byte	Två skruvar, PH1

Dim-to-warm, and why

Most dimmable LEDs hold their colour temperature all the way down, which is technically consistent and looks wrong: a fire, a candle and a filament lamp all go redder as they go dimmer, and four hundred thousand years of evening have taught everybody to expect it. The LK‑9 tracks 2700 K at full down to 1800 K at the bottom of its range.

Turn the dial in the header of this page all the way down and back up. The drawing on every page of this site is drawing that curve, using the same blackbody approximation the driver uses.

Ra 97 with R9 above 90 is the other number that matters and the one nobody prints. R9 is deep red — skin, wood, food, anything alive. A lamp with Ra 90 and R9 of 20 will make a room look like a photocopy of itself and every figure on its box will be true.

Replaceable, not sealed. A luminaire you cannot re-lamp is a disposable object with a five-year fuse in it, whatever else is said about the materials.

Out of the shade

Grade	Transmission	Out of a 806 lm module	CCT out	Reads as
BJÖRK	58 %	467 lm	3000 K	The palest and the brightest
GRAN	44 %	355 lm	2700 K	The house default
TALL	31 %	250 lm	2400 K	Amber
ASP	26 %	210 lm	2200 K	Grey-warm and deliberately dim

Measured in an integrating sphere at Umeå universitet, on 0.8 mm walls printed at 0.28 mm layers. A 0.20 mm wall — RIMFROST and DIMMA — passes about 6 % more.

For a specification

DALI‑2 driver, emergency variant, IES and LDT photometrics, a DIALux plugin file, CE and EE-register numbers, RoHS and REACH declarations, and a five-year warranty on everything including the module. All of it on request and none of it behind a form that asks for your job title.

Contract shades are printed in the same room on the same machines. The only differences are the driver, a fire-retardant grade of KOL for the hardware, and a serial number moulded into the cap so a replacement in 2038 matches.

Specification [email protected]

PhotometricsIES + LDT, all ten forms

DriverPhase, DALI‑2, or 1–10 V

Warranty5 years, module included

Sparesprinted from the original file

Lead, 60 units6–8 weeks