That's okay... I thought I knew what it might be, but I was wrong.
My Poser Pro lights (in a render with GC switched off) look exactly the same in a Poser 7 render.
puzzled

(edit) - but I do feel you should be looking for other differences than the lights

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)