Timeline for If Infrared not visible, why the red LEDs?
Current License: CC BY-SA 3.0
3 events
| when toggle format | what | by | license | comment | |
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| Aug 2, 2017 at 5:30 | comment | added | user57037 | @SDsolar, Yes, I have seen those filters. They block most visible light but pass IR. | |
| Aug 2, 2017 at 5:08 | comment | added | SDsolar | I have seen the same with some TV remotes, too. Taken apart you can see they have a plastic filter that helps to block the visible portion. | |
| Aug 2, 2017 at 4:49 | history | answered | user57037 | CC BY-SA 3.0 |