Perhaps you could use more LEDs? Or improve the sensitivity of the receiving end? Shield the receiver from extraneous light? You have not told us what this is for so I am guessing at possible answer= s. Here are some 10 candle power LEDs, That is 10,000mcd from a single LED. They are a bit expensive unless you buy in quantity, but they are highly visible in outdoor applications. <> Full URL below <> Another source of high output LEDs <> KF4HAZ - Lonnie ----- From: "Attila Muhi" Hi list, >=20 > I need a monochrome (almost) light source for a project. So far I have= been playing with high intensity LED:s around 650 nm (EL383-2SDRC), with= an output of about 3700 mcd at 20mA. For some reasons I need more ligh= t than that, so I run the LED:s at 50mA. This is way out of specs, which = says a max fwd current of 35-40mA. I also need to run the current contino= usly. I get a temp rise of course, the surface of the LED goes up to 42-4= 3 degrees. The temp rise itself is no problem, but I wonder how much the = overpowering affects the LED:s lifetime ?=20 >=20 > As far as I can see, I have three alternatives: >=20 > Continue as before=20 >=20 > Finding a better LED (Any ideas ?) >=20 > Use a laser. (expensive solution) >=20 > Regards >=20 > Attila - SM4RAN > ______________________________________________________ >=20 > Gratis visitkort - klicka h=E4r !=20 >=20 > Allt inom e-handel! www.torget.se _______________________________________________ http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist