TECHNICAL NOTE13 MIN
DALI-2 vs 0-10V vs Phase: choosing the control backbone for luxury homes
Why addressing individual drivers over two-wire digital bus prevents costly rewiring when interior layouts change.
05 MAY 2026Read Note
THE EDISON JOURNAL
Notes on light
Written by our lighting designers and engineers. Mostly technique, occasionally opinion, never a press release dressed as an article.
TECHNICAL NOTE14 MIN READ·24 JUL 2026
CRI 90 is not good enough, and R9 is the reason
The general index averages eight pastel test colours and quietly ignores saturated red. Two fixtures can both claim 92 CRI while one makes teak look like cardboard. Here is how we measure and specify what actually matters.
D
Devang M.
Head of Optical Engineering
NEW RELEASE5 MIN
Introducing Strata: continuous micro-optic wall grazer with 6° beam
Extracting micro-texture from Italian travertine and raw fluted concrete with zero optical scallop.
14 MAY 2026Read Note
PROJECT STORY12 MIN
Lighting the loom: how we engineered the TOSSA woven pendants
Balancing natural cane translucency with hidden anti-glare COB engines for high-end coastal residences.
22 MAY 2026Read Note
TECHNIQUE5 MIN
Cut-off angles: why dark-light reflectors disappear from sight
Achieving UGR < 12 without sacrificing foot-candles. The physics of 45-degree shielding angles and specular black baffles.
01 JUN 2026Read Note
TECHNICAL NOTE10 MIN
3-Step MacAdam Ellipse: why LED binning makes or breaks white walls
When five downlights cast three different shades of warm white on the same gypsum ceiling, binning tolerance is the culprit.
08 JUN 2026Read Note
TECHNIQUE7 MIN
Cove lighting: the 100mm that decides everything
Get the setback wrong and you see the strip, the scallops, or nothing at all. A detail drawing you can trace.
15 JUN 2026Read Note
WEEKLY SPECIFIER BRIEFING
Get technical notes straight from our lab
Optical calculations, photometrics, dimming schematics, and new architectural fixture teardowns delivered every fortnight. No spam, ever.