<p>Hans - thank you for info posted long ago on old Bowens heads. I was about to dump my old bo-lite but thought to look for spare parts and/or info before burial. Nothing to lose I went through a version of the 1/2 second - 1 second - 5 second power up routine and amazingly after 15 mins charge I got a pop on test button. It's not very powerful but the barn doors and grid have made it very useful to me - it has been a key light in many a set-up so deep gratitude to yourself - made my day. Derek Simpson</p>