THanks guys.
Exactly as I thought.
I had already made a little spectrometer with a slit and a DVD and my phone camera.
It took surprisingly good pics. Using this I could see a clear "space" between the sources, indicating to me it HAS to be a different wavelength.
The Chinese company are...
I recently purchased some 1W 660nm deep red led's singly.
I tried to find a supplier who could supply them on as flexible strip.
Infortunately as soon as it arrived, I powered it up and it was standard 630nm orangey red.
I shone my 660nm torch next to it and it was obvious.
I challenged the...
