No, it runs noticeably dimmer, although it's still plenty bright... I got somewhere around the mid 700s in Lux from the L4 body, and the low-500s in Lux from an E1 body...
Also this one and the next couple that follow it too. Speculation that the L4 may have "built-in" protection for Li-ions. /ubbthreads/images/graemlins/thinking.gif