3 ms·

Being kind of a maniac for glow in the dark stuff, this isn't quite true. I've filled up flask bottles with glow gravel of this variety and, after a "charge,"

Being kind of a maniac for glow in the dark stuff, this isn't quite true. I've filled up flask bottles with glow gravel of this variety and, after a "charge," poured it out -- the interior gravel did indeed get charged. I think you would need much more thickness than a centimeter or two for the interiors not to get charged up. (Yes, I had a bunch of bottles filled up and arranged on a rope so they would glow softly during the night because I'm weird like that)

pengaru 4y ago
Since you seem to have done some experiments, what effect does increasing the bottle size have on the glow? Duration or brightness changed? No visible effect?
- at_a_remove 4y ago
  You max out pretty fast. Most people don't understand the incredibly wide (over so many orders of magnitude) ranges our eyes (and ears) function over. Once you're in the dark, the glow is quite visible but it wouldn't have been very notable before. And so the absorb-release cycle can penetrate rather rapidly. If I had to guess, with the gravel, that would die off at maybe a few centimeters of depth. Essentially, you're getting just surface area at a given brightness, despite the interior gravel getting charged. With the zinc sulfides, they really did take much longer to hit their max charge, although I never measured it.
  - batch12 4y ago
    > Most people don't understand the incredibly wide (over so many orders of magnitude) ranges our eyes (and ears) function over. For sure. Last year while walking through the woods on a cloudy, new moon, 3am morning I saw a green light piercing through the trees. It was difficult to find because it was over a hundred feet away. Once I reached it, I found a single green LED. It wasn't an ultra-bright variant or anything-- just a normal LED attached to a camera.
  - int_19h 4y ago
    I wonder, if one were to specifically design some kind of lamp based on this, what would be the ideal shape to maximize the emitted useful light for a given volume.

pengaru 4y ago

Since you seem to have done some experiments, what effect does increasing the bottle size have on the glow? Duration or brightness changed? No visible effect?

at_a_remove 4y ago
You max out pretty fast. Most people don't understand the incredibly wide (over so many orders of magnitude) ranges our eyes (and ears) function over. Once you're in the dark, the glow is quite visible but it wouldn't have been very notable before. And so the absorb-release cycle can penetrate rather rapidly. If I had to guess, with the gravel, that would die off at maybe a few centimeters of depth. Essentially, you're getting just surface area at a given brightness, despite the interior gravel getting charged. With the zinc sulfides, they really did take much longer to hit their max charge, although I never measured it.
- batch12 4y ago
  > Most people don't understand the incredibly wide (over so many orders of magnitude) ranges our eyes (and ears) function over. For sure. Last year while walking through the woods on a cloudy, new moon, 3am morning I saw a green light piercing through the trees. It was difficult to find because it was over a hundred feet away. Once I reached it, I found a single green LED. It wasn't an ultra-bright variant or anything-- just a normal LED attached to a camera.
- int_19h 4y ago
  I wonder, if one were to specifically design some kind of lamp based on this, what would be the ideal shape to maximize the emitted useful light for a given volume.