On Mon, Feb 8, 2010 at 10:10 PM, Richard Prosser wrote: > It's not just brightness however. A flashing light is generally more > visible/noticable than a steady one. I don't know what frequency this > takes effect. Probably <20Hz I would imagine. Depends of course what you're using an LED for - the high output LEDs we're talking about here are white ones which tend to be used for illumination - visibly flashing lights aren't particularly useful for this! Chris -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist