ᐅ Recommendation for LED downlights

Musketier schrieb:
The spacing depends on the beam angle and ceiling height.

This can be calculated quite easily using the tangent function:
Tangent alpha = Opposite side / Adjacent side

Opposite side = Radius of the illuminated area on the floor
Adjacent side = Room height
Alpha = Half of the beam angle

Rearranging the formula a bit gives:
Radius of the illuminated area = Tangent (beam angle / 2) * Room height

I then drew the room, arranged the ceiling spots in a pleasing layout, and used a compass along with the calculated radius to mark the illuminated areas. If any unlit areas remain, the position of the ceiling spots must be adjusted or additional spots added.
But be careful: If the spot is meant to illuminate, for example, the work surface, then for the formula the distance from the ceiling to the work surface should be used instead of the full room height.

Thank you! Now I know what I don’t miss about my (long past) school days.

P.S.
This is not my original idea, although these were topics I liked at school (unlike differential and integral calculus). I only read about this somewhere when I was installing the spotlights at my place. I found it quite helpful since, at first, I had no clue how to choose the spacing.

I knew why I became a business administration graduate. Simple math suits me; the rest... better not.

The price differences are not just in the brand name but also in the quality. With brand-name manufacturers, you usually get a 3-5 year warranty on the spotlights, which quickly justifies the higher price. However, for example, Ikea spotlights are also quite good. So far, I haven’t had any failures, regardless of the manufacturer.

It is important not to choose those with many small “bulbs” inside, as that is completely outdated technology, less efficient, and tends to break quickly.

When planning with LED lamps, you should not focus on watts but on the lumen output, as opposed to incandescent bulbs, because the relationship is not simply linear. A 15-watt spotlight typically produces 1200-1500 lumens, which corresponds to a 90-100 watt incandescent bulb.

We are currently planning our LED spotlights for the ceiling on the ground floor and the covered outdoor area. In the city villa, the lights would hang quite high. Almost no one in the new development has something like this— is that too high for a city villa? We want to use them to illuminate the walkway to the front door and the driveway to the carport. The terrace will probably be better illuminated with regular wall lights. But when does one actually need lighting outside on the terrace? It might also make sense to use lights in the covered outdoor area here. However, we want to avoid a situation where that might not be sufficient and we haven’t installed cables outside for wall lights...

We are also building an urban villa, but we decided to use wall lights on the exterior. Some have motion sensors, while others do not. For those without motion sensors, there is an interior switch.

Installing lights in the roof overhang would be too far from the pathway, and eventually, the lights will need to be replaced.

There are also very attractive pathway lights available as post lights.