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LED wavelengths
Posted: Wed Feb 08, 2023 5:39 am
by MichaelG.
Technology evolves, of course … but here is a useful primer:
https://www.photonics.com/Articles/Ligh ... mer/a36706
The paragraph about
Green LEDs is particularly interesting in light of [
sorry for the inevitable pun] the current discussion about imaging bacteria.
MichaelG.
.
Edit: __ another useful list here:
https://www.cresttech.com.au/led_info_wavelength.html
… less technical, but it includes descriptive names for various wavelengths
Re: LED wavelengths
Posted: Wed Feb 08, 2023 10:46 pm
by Hobbyst46
Thanks MichaelG !
Re: LED wavelengths
Posted: Thu Feb 09, 2023 12:11 am
by Scarodactyl
I don't think that summary is fully accurate--my understanding anyway is that the green gap reflects a legitimate technical challenge rather than a lack of interest.
Re: LED wavelengths
Posted: Thu Feb 09, 2023 9:40 am
by Hobbyst46
Citation from
https://www.photonics.com/Articles/Ligh ... mer/a36706:
(1)
"
Pulsing LEDs in high-current and/or high-voltage mode for arrays in a series-parallel configuration creates a unique set of problems. For the novice designer, it is not practical to design a current-controlled pulse drive with the capability to deliver 5 A and 20 V. There are a few manufacturers of specialty equipment for pulsing LEDs."
Why so ? would that be true for, say, 2A at 12V, which would be fine for microscopy ?
(2)
Just typed "550nm LED" and found Lumixtar.com who offer 540nm, 550nm LEDs, so the "
green gap" is not entirely flat...?
Re: LED wavelengths
Posted: Thu Feb 09, 2023 1:30 pm
by MichaelG.
Scarodactyl wrote: ↑Thu Feb 09, 2023 12:11 am
I don't think that summary is fully accurate--my understanding anyway is that the green gap reflects a legitimate technical challenge rather than a lack of interest.
I think their point was that technical challenges would be addressed if there was sufficient market interest.
It’s a matter of how you prioritise available effort.
MichaelG.
Re: LED wavelengths
Posted: Thu Feb 09, 2023 1:36 pm
by MichaelG.
MichaelG. wrote: ↑Wed Feb 08, 2023 5:39 am
Technology evolves, of course … but
Just as a reminder of my opening line ^^^
I would be
very happy to see this thread kept up to date regarding ‘state of the art’
MichaelG.
.
P.S.__ I didn’t notice a first publication date for the piece originally linked, it may already be years out of date.