On 05/04/2011 05:04, RussellMc wrote: > I'd be interested in 3 LEDS phased 120 degrees apart with relatively > close physical locations (ie as small a part of a multiple of a > typical string wavelength as possible.) > I'd expect that that arrangement MAY give you a light chaser effect, > with chaser direction giving a clue re direction of off-tune. Thanks for the idea, will give that a try too. > Modern white LED phosphor response is very very very fast (more nano > second than micro second range) so they should do well. Narrow angle > or shrouded may also help. Yes, I was thinking fast, bright, and narrow would be best. I have no=20 suitable ones in stock though, so I'm looking at what RS/Farnell have to=20 offer. I thought this might do okay: http://uk.rs-online.com/web/search/searchBrowseAction.html?method=3DgetProd= uct&R=3D7134024=20 Any thoughts? Is there anything of similar price that is better? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .