A well-chosen molding or cornice can vanish at nightfall, or gain real depth. It all comes down to a detail that tends to be settled last, and in a hurry: the angle at which light meets the wall. A floodlight stuck in the ground and aimed straight at the facade flattens every volume; two small sources, well placed, sculpt them.
Here is how to think about lighting a decorated facade before buying a single fixture, and which rules to keep in mind.
Relief lives on shadow, not on light
A molding reads through the shadows it casts. Strong, even, frontal light erases them: window surrounds, cornices and rustication melt into a flat wall. Grazing light, placed close to the wall and aimed up or down, carves every profile and brings out each projection.
The practical rule is simple: the finer the decoration, the closer and softer the source should be. For a deep cornice, light the underside and the cove; for a window surround, pick out the sides rather than drowning the whole frame.
Choosing the right color of light
Color temperature is measured in kelvins. Warm white around 2700 to 3000 K flatters cream, sand and stone tones; cool light at 4000 K or more looks clinical and makes a pale facade look grey. For a decorated facade, warm white is the safest choice.
Consider the color of the decoration too. An off-white acrylic finish reflects a lot of light, so a modest source is enough. A dark finish absorbs more and needs extra output, or its profiles simply stay invisible.
Placing the sources
A few principles help avoid the usual mistakes:
- light upward to bring out projections, using wall lights or recessed spots a few tens of centimeters from the wall;
- keep downlighting for canopies, overhangs and cornices, which naturally catch a cascade of light;
- space sources evenly to avoid bright hot spots right above each fixture;
- hide the fixtures: people should see the effect, not the spotlight.
Do a night test with a flashlight before drilling anything. Moving it at different distances from the wall quickly shows the angle that reveals the decoration without flattening it.
Fixing and wiring without damaging the decor
Expanded polystyrene (EPS) elements with an acrylic coating are light, but a heavy fixture should not be mounted directly on them. Anchor the fixture in the load-bearing wall and keep the decoration out of any heat zone. Heat is the point to watch: a poorly ventilated source pressed against EPS can mark it over time. LEDs run cool, but their housing must stay clear.
On the electrical side, outdoor fixtures carry an IP protection rating; IP65 is common for lights exposed to rain. Have a qualified electrician run the cables in suitable conduits and seal each cable entry so that no water path is created into the wall.
What the rules say
In France, the order of 27 December 2018 governs light pollution. For facade illumination of non-residential buildings, it sets switch-off at 1 a.m. at the latest and a color temperature not exceeding 3000 K. For a private home there is no dedicated facade switch-off time, but you must not disturb neighbors with intrusive light. Local rules (urban plan, protected area, nature park charter) can be stricter, so check with your town hall and confirm the text currently in force, as it may change. Outside France, local rules differ.
In practice, a facade lit with restraint, in warm white and switched off late in the evening, follows the spirit of these rules and costs less to run.
The mistakes that come up most
The first is over-lighting: too much power erases shadows. The second is choosing light that is too cold. The third is deciding on lighting after the facade is finished, when conduits could have been planned during the works. Finally, many people forget to judge the result from a distance, from the street, which is where the facade is actually seen. To see which profiles are worth highlighting, browse our exterior moldings and decorative cornices.
