The hot tub that feels like a stage
During the day distance hides you. At night being the brightest thing in the frame puts you on stage.
At this hour the seat is much brighter than the ground the observer is standing on, which is what makes a person read clearly from outside.
Light on the seat
20.4
lux
Thrown sideways and up
50
per cent of output
Most visible to
92
Right neighbour's bedroom
| Who | Line | On you | On them | Contrast | Reads as |
|---|---|---|---|---|---|
| Left neighbour's landing window | blocked | 20.7 lx | 0.4 lx | 52× | invisible |
| Right neighbour's bedroom | open | 20.7 lx | 1.4 lx | 15× | lit up |
Contrast is the ratio between the light on you and the light where they are standing. Being three or four times brighter is what makes a person read clearly at a distance a daytime sightline would hide.
2400 lumens at 3 m, on from 17:00 to 24:00.
Puts about 20.4 lux on the seat.
Shielding guidance follows DarkSky International. The principle that does the work is simple: light the ground, not the sky, the neighbour or yourself.
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