I was recently given a Speedtron Blackline 2400 w/s power supply, with three light stands, three shoot through umbrellas, three reflecting umbrellas, storage/carrying case and spare bulbs. I have used my three Nikon flashes with Pocket Wizards but this a completely different animal. I have a Sekonic L-758DR flashmeter which should help. What is your favorite lighting book or educational website with will help me explore this system to the fullest. Shoot through vs Reflecting umbrellas? Advantges of Light boxes? Lighting ratios etc. Lots of questions!