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infrared led faq

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qadmus 2021-08-26 15:40:28 -07:00
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FAQ.md

@ -26,6 +26,7 @@ Table of Contents
* [Will the comma two kill my car battery?](#will-the-comma-two-kill-my-car-battery)
* [Can I adjust the brightness calibration?](#can-i-adjust-the-brightness-calibration)
* [My storage space is filling up, How long are drive segments kept on my device?](#my-storage-space-is-filling-up-how-long-are-drive-segments-kept-on-my-device)
* [What are the infrared emitter specifications, and are they safe?](#what-are-the-infrared-emitter-specifications-and-are-they-safe)
* [comma prime](#comma-prime)
* [What are comma points for?](#what-are-comma-points-for)
* [Development](#development)
@ -122,6 +123,9 @@ Step by step guide for accessing video files [here](../wiki/Video-Files).
### My storage space is filling up, How long are drive segments kept on my device?
> Videos are saved on your device until additional room is needed. When less than 5GB or 10% of the drive space remains, the oldest segments will be deleted to clear up room. On the Comma 2, this results storage for around 12 hours of segments. The oldest segments will be deleted to make room for new segments even if the old segments have not been uploaded.
### What are the infrared emitter specifications, and are they safe?
> The IR LEDs emit near 850 nm, and combined are rated for 3 Watts continuous but limited to 1.5 W in software. Assuming 75 degree spread at 70 cm distance, the intensity is [0.16 mW/cm^2](https://www.wolframalpha.com/input/?i=1.5W+%2F+%28pi*%28tan%2875%2F2+degrees%29*0.7m%29%5E2%29+to+mW%2Fcm%5E2). A recommended continuous exposure limit to avoid thermal injury is [< 10 mW/cm^2](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3116568/)
# comma prime
### What are comma points for?