| The blue LEDs in my aquarium lighting system emit a considerable amount of ultraviolet. Some of the corals fluoresce in response. The reason the system has blue LEDs is as an attempt to simulate a moonlight cycle (daylight, moonlight, and darkness are controlled by timers), which, in the wild at least, encourages the corals to reproduce. At night, the low light of the moon, combined with seawater's tendency to filter to green and blue, led to the idea of blue LEDs serving in this role. Does it work? I think that's a little bit debatable at this point, but it clearly doesn't hurt, and so... 😊 #aquarium EXIF:
| Width: | | 1743 |
| Height: | | 1162 |
| Company: | | Canon |
| Camera: | | Canon EOS 6D |
| Shot On: | | 2014:08:24 12:37:55 |
| Lens Model: | | EF85mm ƒ/1.8 USM |
| Aperture: | | ƒ/22.0 |
| Focal Length: | | 85.0mm |
| Metering Mode: | | Pattern |
| Exposure Mode: | | Auto |
| Flash: | | Did Not Fire |
| Exposure Time: | | 20.0 seconds |
| Exposure Program: | | Aperture Priority |
| ISO: | | 100 |
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