I have a few IR emitters I ran in an Ultrafire WF501b host for night illumination of a digital scope. It has been quite a few years since I needed them but now I need a working IR light, preferably 850nm. How can I tell which wavelength emitters I have. All I have are these numbers on the little bags they shipped in.
Look them in the eye, when they are on. If you see a faint very dark red spot it will probably be an 850 nm. emitter.
I see an easy to see red dot…?
What happened to the forum? It looks really dead here now.
The younger members getting hitched, starting families, starting business and careers, the elder members…finding different interests and hobbies, long time members taking breaks and whatnot, Newcomers popping in for quick advice, and generally the consumer market for lights has essentially caught up with the enthusiast market in terms of “innovation” and capability.
Welcome back, in any case. It’s so darn shiny in today’s world it’s hard to see what really stands out…
Cruising the interweb you will come across exotic IR emitters with rare wavelengths.
Given the fact you bought them in a drop-in leads me to think they are middle of the road variety, so either 850 nm or 940 nm wavelength.
850 nm is about the longest wavelength a human eye can see, that will be dark red.
940 nm is beyond what humans can see.
So if you see a red dot, it’s probably an 850 nm emitter. If you can’t see anything its probably a 940 nm emitter, or it’s broken.
Henk4U2 gave you the short version. Less words, same outcome. But you were displeased.
