Lighting design before electrical design allows review of layers, positions, control and wiring. This list is a practical risk checklist, rather than a statistic from completed projects.

The worst call is 'one ceiling light is enough'. With no layering the room reads flat, shadows fall in the wrong places, intimacy disappears. Fix: three layers minimum.

Second is 4000–5000 K everywhere. It feels clinical. Residential should be 2700–3000 K, Hospitality 2700 K + Warm Dim. 4000 K belongs in offices or the kitchen task zone.

Ra 80 alone does not determine every material’s appearance or installation suitability. For demanding colour rendering, consider higher fidelity as a design target and check R9, available Rf/TM-30 data and samples.

An incompatible dimmer, driver and LED combination can flicker, buzz or become unstable at low levels. Select a solution using manufacturer data and a test of the complete combination; changing protocol alone does not guarantee the result.

Smart installs without programmed scenes — investment with no return. Fix: define 4–6 scenes by ritual (Morning, Work, Movie, Guests, Sleep).

Downlights directly above bed, dining or meeting table — glare and ugly shadows on faces and food. Fix: move them off-centre, use dark-light optics, or replace with a wallwasher.

Choose bathroom and wardrobe CCT for use and preferences. 4000 K alone does not mean colour distortion; check skin and textile rendering separately under the actual source.

Practical applications

Living room retrofit

Add cove ambient, reading lamp, art accent, floor lamp; dim via DALI or at least 1–10 V.

4000 K kitchen

Swap to 3000 K CRI ≥ 90 + Warm Dim on pendants; wire under-cabinet strip separately.

Bedroom with overhead downlight

Move downlight above the foot of the bed, add cove ambient (2700 K), bedside reading sconces with individual dimming, floor-level night strip.

Smart home with no scenes

Re-program KNX to four scenes (Morning, Guests, Movie, Night) on physical entry buttons.

Advantages

Up-front planning pays back in quality of life and property value
Layering + Warm Dim transform any room
Dimming and scenes can reduce consumption; service-life effects depend on the assembly and operating conditions

Limitations

Retrofitting is always pricier than planning ahead
Some fixes need bigger renovation (coves, extra circuits)

Recommendations

Lighting concept consultation before electrical engineering
At least three layers in every living room
CCT 2700–3000 K residential, 3000–4000 K task zones
Design recommendation: consider CRI ≥ 90; assess higher targets for the actual materials and task
Dim through a quality driver (trailing-edge, 1–10 V, DALI-2)
Define scenes by family ritual before any Smart install
No downlights directly above bed, dining or meeting tables

Common mistakes

Single ceiling light with no layering
4000–5000 K in residential (hospital atmosphere)
CRI 80 LED strip above the dining table
Incompatible dimming with unstable light at low levels
Smart install with no scenes programmed
Downlights directly above the bed or dining table
Cool light in bathroom and wardrobe
No floor-level orientation for the path to the bathroom
Mixing CCTs (3000 K + 4000 K) in the same room
Missing eye-level layer (floor / table lamp)

In summary

Planning before electrical design helps identify mistakes early. Review layers, CCT, colour rendering, dimming compatibility, scenes and glare for the needs of the actual space.

Want a quick estimate of the luminaire count? Open the lighting calculator.

Sources

DALI Alliance — Key features

Above dining tables, kitchen islands and in living rooms, pendant lights are the most common choice. See our selection in the Pendant lights category.

The most common mistakes in residential lighting and how to avoid them