Hi all,
An update on this. Unfortunately my search for a suitable led that is reliable and in the form factor i wanted has only resulted in one choice of led that was too expensive to make it economically viable. All of the leds that i looked at just did'nt cut it. So, a bit of back to the drawing board on this. I'm looking at a completely different LED now and enclosing that in a plastic bubble..
Under contstruction now. I'm now looking at strings that are 20 strobes long at 300mm ( 1' ) spacing..