Quote:
Originally Posted by Max
Hi,
IR leds... like any led stuff have epoxy container and some "cup" stuff... these things have a strong impact on e.g. aperture angle of light emitted... you can test very easy...
At meters this kind of propagation will make you "illuminate" several square meters of soil... cause these things are not lasers... their use is mostly for remote controls and it's good for remotes having such large diffusion of IR light, otherwise you'll have to aim the remote to the VCR/DVD thing... (like in cheap chinese stuff, very annoying !  )
If wanna a narrow spot you MUST use a laser module...
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I must have a Chinese one, must aim directly at cable TV box, then wiggle around till it recognises it.
Perhaps cheap, Chinese led's have different lens/focal length, tighter beam?
Aurificus