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The Cheetah CL-180's are marginally more powerful than speedlights, but fall well short of a monolight like the PCB Einstein. Cheetah's offer great portability, their trigger system can control more zones than anyone can keep up with, and the lithium battery pack is good for something like 800 full-power pops. It's a pretty nice system when used within its limits. Cheetah, by the way, is expected to introduce a CL-360 (double the power) in about 2 weeks. For large groups outdoors, however, monolights still rule.