I own four Photogenics (600ws) lamps and they are fully scaleable. I have owned Excalibur lights (320ws) but they couldn't stand up to heavy use and died two months after the warranty expired. If you're going to shoot large groups then you'll need quite a bit of power so get the big bang for your buck.
The modeling light is also fully scaleable and stays on during the recycle time, usually 1 to 1.5 sec at full power.
There are many teachers who could ruin you. Before you know it you could be a pale copy of this teacher or that teacher. You have to evolve on your own. -BereniceAbbott