I received a replacement from CatEye for my EL500 (the one I bought in October that had a disquieting tendency to randomly switch off). The replacement unit seems to have a different LED. The color of the light is greenish instead of blue-white, and it doesn't appear to be quite as bright.
(If you shine them both on a wall the difference in color is quite striking. And I've swapped batteries around between them enough to assure myself that that's not the problem.)
I sent the first replacement unit they sent me back because of this, but the second replacement has the same greenish LED.
The tech-support folks at CatEye assure me that nothing has changed-they are using the same kind of LED in current production runs as they were in October.
Has anyone else seen this change?