It may be worth checking this link at the German company Heiland.
I don´t know what state this lighthead is in right now, but it certainly
looks interesting. Unfortunately I didn´t find any English translation,
so you may have to dig out your old German dictionary from the basement.
Good luck and best regards from

Karl-Gustaf Hellqvist

http://www.heilandelectronic.de/html...licht_main.htm