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chris you have been a great help thanks again

Thanks for the pointers guys i am going to do a little more research and i will get back to you all

Have you ever heard of a 680nm led by design anyway? Some said they read an articale about one but i have yet to find one myself.

for this application it needs to be exact which may be none existing?

680nm is the only requirment that i have the other parameters could be anything you name it!!!! Again 680nm is all you need to know. Thanks

I am looking for some red light emitting diodes. I need a wavelength of 680nm can anyone guid me in the right direction.Thanks