Wednesday, December 30, 2015

Things They Should Invent: streetlights with time-sensitive variable brightness

I was walking down a residential side street at about 5:30 pm in the bleakest depths of December, and I found it uncomfortably dark.  The street did have perfectly normal streetlights at perfectly reasonable intervals, but I found myself wishing the lights were significantly brighter.

Of course, the problem with making the lights significantly brighter is that they're right in front of people's houses.  No one wants a giant floodlight just metres from their window in the middle of the night when they're trying to sleep.

But what if they could program the streetlights so they start out brighter in the early evening and get less bright as we transition towards bedtime? We could have a safe, well-lit rush hour even in bleakest midwinter, while still making it possible for people who have a streetlight in front of their house to sleep comfortably at midnight.

In the summer, when it doesn't get dark until 9 pm, the streetlights wouldn't have to start out as bright as they do in the winter, but they could still dim as the hour gets later.  In other words, the streetlights are the same brightness at 9 pm in June and at 9 pm in December, they're just brighter at 5 pm in December (but completely switched off at 5 pm in June because it's still bright and sunny out.)  They wouldn't ever get darker than they are now, they'd just get brighter during hours when no one is anywhere near ready for sleep.

We already have the technology. Dimmer switches have existed for decades (I was originally going to title this "dimmer streetlights" but that would make it sound like I just want the streetlights to be less bright), and programmable dimmers already exist in household products such as the Phillips Wake-Up Light.  If they can deploy this technology on a large scale in streetlights, our streets would be safer and more user-friendly for the vast majority of users.

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