[HN Gopher] Energy Saving Road Lighting in Norway
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Energy Saving Road Lighting in Norway
Author : CharlesW
Score : 22 points
Date : 2023-05-13 19:59 UTC (3 hours ago)
(HTM) web link (www.dailyscandinavian.com)
(TXT) w3m dump (www.dailyscandinavian.com)
| sschueller wrote:
| We have similar setup at tram/bus stations here in Zurich,
| Switzerland. When you sit still on the bench the lights will
| start to dim down and once one move they will brighten up again.
| A bit odd sometimes...
| ChuckNorris89 wrote:
| The toilets at my work do that, the light turns off if it
| detects no movement so I need to start waving my hands while
| I'm on the john and end up in the dark.
| sbierwagen wrote:
| If the sensor is near the door it should be able to just
| count people coming in and out.
| chmod775 wrote:
| That "just" hides something that is so insanely hard to
| make work reliably in practice, any implementation of it is
| likely worse than a simple motion sensor... or a light
| switch.
| zeristor wrote:
| If you're in a cubicle with no smart sensor, there's nothing
| to see your waves of despair.
|
| Never underestimate the torch screen on a smart watch, just
| so long as the sleeve doesn't slide down to cover it.
| Malic wrote:
| I've noticed that hotel hallways in Norway worked the same way.
| While on a tour, I poked my head out of my room quite early to
| begin the day - it was pitch black but only for a moment. My
| motion clearly set off the detectors and the hallway fully lit
| up.
|
| I kinda wish this was the norm in other countries for apartment
| buildings, hotels, etc.
| sargun wrote:
| I've been in apartment buildings state side that kinda have
| this, but there was always some light. Enough to see the exit
| at least. I think I'd be scared shitless if it was pitch black
| because of motion detector failure.
| wenc wrote:
| Many older stairwells in Europe (Italy/Spain/Portugal) are
| like this.
|
| They're pitch dark, but you turn on the first switch which
| gives you enough light to reach the landing (and they are
| timed), and then you have to turn on another light, and so
| on. But if you don't get there quickly enough, it'll be pitch
| dark.
| geerlingguy wrote:
| The Novotel North Cambridge hotel in the UK had lights that
| come on when you approach in all guest corridors, as well as
| room lights that require a room-key-size card to be inserted
| into the main light switch (so they all switch off if you leave
| the room, along with HVAC going into away mode).
|
| I've also seen a number of grocery stores adopt display
| lighting that turns on only when presence is detected.
| bombcar wrote:
| The grocery store thing is getting more common in the US - a
| friend said it makes her want to dance like a Disney princess
| :)
| jeffbee wrote:
| Energy-saving HTTP serving, too.
| agumonkey wrote:
| just in case https://archive.is/Uw6wK
| wenc wrote:
| The article claims that they save 2.1 MWh per week (109 MWh per
| year) with a payback period of 4.5 years in Norway. It doesn't
| say how much it costs, but Norwegian electricity prices are
| around 83 EUR/MWh, so we can estimate that the lighting system
| costs roughly EUR 40k (US$43k).
|
| Wholesale grid prices in the US are around ~$252/MWh at peak,
| which means the payback period in the US is only 1.5 years give
| or take, which is not a bad investment.
|
| https://www.eia.gov/electricity/monthly/update/wholesale-mar...
| [deleted]
| hansjorg wrote:
| I had no idea this was a thing until a recent trip.
|
| For a small while I was certain I had become too tired and had
| started seeing things. Quite trippy seeing another car about a
| kilometer ahead igniting the lights as it drove.
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(page generated 2023-05-13 23:00 UTC)