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Who tells you half the floor has gone dark?

Half the floor dark, and the shop open

It is 20:15 and the right-hand half of the shop is dark. A whole run of light fittings never came back on after this afternoon’s voltage dip, and the shelves at the back sit in gloom: the floor stops shining exactly where the light ends. Everybody is in the left-hand half, the one still lit. Nobody has called maintenance, because looking at the ceiling is nobody’s job.

6 cameras across 5 sectors

This is how you ask for it

«“Alert me if the lights go out in part of the hall, and tell me which part, even if the rest stays on.”»

Half the floor stops selling that night, and the next, and the one after, because a light going out makes no noise and can stay like that for weeks. Besides what does not get sold, there is what cannot be seen: in a dark area the camera sees worse too, so the unlit stretch becomes a hole in everything else. And in a station or a tunnel that is no longer about sales: it is people walking where there is no light.

You decide once

You decide which areas have to be lit and when: the sales floor while the shop is open, the station concourse until the last train, the substation yard all night with the red beacon on. You decide whether the alert goes to maintenance, to the control room or to both. And you decide the opposite case, which also costs money: an alert if a wing is still lit at three in the morning.

A blown light calls nobody. No alarm goes off, it appears in no report, and the building keeps working exactly the same, only slightly worse. So the warning almost always arrives by one of two bad routes: a customer mentioning it at the till, or someone noticing at closing time, three weeks late. And in a tunnel or on a platform it is not a comment at the till: it is a stretch people keep walking through in the dark.

IRIS looks at the same thing you look at when you walk in: whether this part of the hall is lit and that one is not. When a stretch that should have light at this hour goes dark, the alert goes out with the camera and the time, and it names the stretch, not the whole building. It works both ways: it also flags the wing that stayed lit all night, which is not a fault but is paid for all the same.

There is one more reason not to let it slide, and it is the one least often told. Where there is no light, the camera sees worse. An unlit aisle does not just stop selling: it stops being watched, and every other rule that depended on that camera goes down with it. That is why lighting is not a separate maintenance chore. It is the condition for everything else to work.

What changes

Before, the fault was reported by a customer or spotted at closing time, and it left behind a maintenance note with no exact hour or place: “some lights have gone in the back area”. Now the alert goes out the same evening, says which stretch went dark and from what minute, and comes with the video. Whoever runs the building decides whether that is a lamp, a breaker or a badly set schedule — but they no longer find out three weeks later.

Where we have seen it

  • Bank of machines, two in the morning. On either side four people are playing, each at their own. In the middle, one machine has a dark screen: no light, no image, and in front of it not even a chair — just a gap in the floor. A step away, a woman stands waiting. IRIS sees the dark screen surrounded by lit ones and counts from which minute it has been that way. What it sees is a machine that has stopped; why it stopped, it does not know.

    CAM-526One dark screen in the middle of a bank of machines that are all lit

    «Tell me if a machine's screen stays dark for more than ten minutes while the ones beside it stay lit.»

    See this cameraCasinos

  • The same bore, at night. The first half has its luminaires on; from one point onwards the vault goes completely dark and stays that way to the far end. Traffic keeps going in regardless: a car has just entered the unlit part, and further ahead all you can see is tail lights.

    CAM-185A stretch of tunnel in the dark

    «Tell me if a stretch of the tunnel loses its lighting, even when nothing else has happened.»

    See this cameraCritical infrastructure

  • The right-hand half of an electronics store has gone dark: the shelving is in shadow and the floor loses its shine. The left-hand half is still lit, and that is where all the people are.

    CAM-74Half the shop floor in the dark

    «Tell me if the lights go out in one part of the floor and tell me which part, even if the rest of the store is still lit.»

    See this cameraRetail

  • Half the concourse is lit and the other half is dark: a whole row of light fittings has not come on. Passengers walk hugging the lit side.

    CAM-91Half the station in the dark

    «Tell me if part of the station goes dark when it should be lit.»

    See this cameraPublic transport

  • Three in the morning. The camera looks at the outdoor switchyard from the corner. The roadway and the building behind are lit, but inside the compound almost everything is off: the transformer is barely there, the bays are invisible and the red beacon on its pole is unlit. Only four light fittings are still on, all of them at the edge. On every other night, at this hour, this same frame is lit.

    CAM-357Tonight the substation is in the dark

    «Tell me if at night there is less light than usual inside the compound, or if the red beacon is not lit.»

    See this cameraIndustry

What it does not do

IRIS does not measure lux and does not replace an instrument reading: it will not tell you whether an area meets a standard. It also does not know why the light went out — a lamp, a breaker, a badly set schedule — and it switches nothing on by itself. And in gloom it sees worse, like anyone: what it detects well is the change, that a stretch had light and now does not.

Questions

Does IRIS measure light levels in lux?
No. IRIS is not a light meter and does not replace an instrument reading, which is what you need to certify against a standard. What it does is look at the scene, see that a stretch that was lit at that hour no longer is, and tell you which one. For a floor manager that is the useful thing at eight on a Thursday evening. For a technical report you need the instrument, and it is better to say so up front.
What if the lights go out because they are meant to?
Then there is no alert. The rule carries a schedule: the floor must be lit while the shop is open, and after closing the opposite is normal. You set that once, with the real hours of the site and the season, and IRIS applies it every day. If the schedule changes in summer, you change the rule; you do not switch the system off. A rule that fires when it should not is a rule everyone stops reading within two weeks.
Does it also catch lights left on at night?
Yes, and it is the same rule in reverse. If an area must be off after a certain hour and is still lit, that gets flagged too. It is not a fault, but it is paid for on the bill every month and nobody looks at it, because at three in the morning nobody walks past. Not everything important is an alarm: sometimes what matters is a number, and here the number is the hours a wing stayed lit with nobody inside.
If the camera also sees badly in the dark, how does it detect it?
Because that is exactly where the change shows. A stretch that was lit and turns black is one of the clearest changes there is in an image, and with the rest of the hall lit beside it the contrast is obvious. One honest caveat: if the camera has a night mode and compensates, the scene may still be visible in black and white, and then the signal is a different one. That is why it is tested with that specific camera before the area is signed off.

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Every simulation

Something has spilled

Tell me if there is liquid or foam outside its place and it is still there two minutes later.

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  3. What it finds
  4. The same rule
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And the best part

What you bought was a warehouse of images.What you needed was someone to look at them.

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