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dive_light_burn_times [2023/09/19 03:12] – qlyoungdive_light_burn_times [2024/07/02 21:57] (current) – add page title qlyoung
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-I like to go cave diving. In cave diving, lights are important, and we carry a bunch of them. The rule in cave diving is to carry at least three lights for redundancy: one primary and two or more backups.+===== dive light burn times ===== 
 + 
 +I like to go diving in dark places. In dark places like caves, lights are important, and we carry a bunch of them. The rule in cave diving is to carry at least three lights for redundancy: one primary and two or more backups.
  
 I use these lights as backup lights: https://www.divegearexpress.com/dgx-600-twist-handheld-light I use these lights as backup lights: https://www.divegearexpress.com/dgx-600-twist-handheld-light
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 My setup is a cheap webcam (the same one used for [[bird bar]]) plugged into a cheap macbook. I placed the webcam on a chair pointing at a wall. On the chair I also placed a tupperware full of water. This simulates the diving environment. Then I fully charged the light battery, turned the light on and placed it in the tupperware facing the wall. Finally, I recorded the camera image using OBS. This way I could check the recording to see when the light stopped burning, as well as view the luminance characteristics as the light discharged, without needing to monitor the light. My setup is a cheap webcam (the same one used for [[bird bar]]) plugged into a cheap macbook. I placed the webcam on a chair pointing at a wall. On the chair I also placed a tupperware full of water. This simulates the diving environment. Then I fully charged the light battery, turned the light on and placed it in the tupperware facing the wall. Finally, I recorded the camera image using OBS. This way I could check the recording to see when the light stopped burning, as well as view the luminance characteristics as the light discharged, without needing to monitor the light.
  
-{{ :img_008905.heic.avif?600|Picture of test setup for testing light discharge}}+{{:img_008905.heic.avif?600|Picture of test setup for testing light discharge}}
  
 It turns out the DGX 600 twist light burns for between 90-100 minutes. Over this time period it gets gradually less bright until it finally goes out completely. It is still usefully bright until the moment it turns off. It turns out the DGX 600 twist light burns for between 90-100 minutes. Over this time period it gets gradually less bright until it finally goes out completely. It is still usefully bright until the moment it turns off.
 +
 +{{:lights-discharge.mp4?633x360|Video of light discharge behavior}}
 +
 +//[[AV1|this video doesn't play!]]//
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 +The apparent increases in brightness in this video are caused by the automatic exposure control of the camera adjusting for decreasing brightness levels and do not occur in reality.
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 +{{tag>diving}}
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dive_light_burn_times.1695093165.txt.gz · Last modified: 2023/09/19 03:12 by qlyoung
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