$500 would be a steal. That isn’t much more than the cost with shipping for a quality ebike battery with the same capacity. It’d be difficult to piece something like this together for the same price. Let’s say a “400W” 200W actual floodlight for $200. $150 for a telescoping quick clamp tripod, but I’d swap that for a $100 stronger speaker stand with lift assist or crank. $300 for battery. $50 for charger. That might be 20% less with diligent and patient searching for the best deals, but it’d be huge, heavy, cumbersome, and less water resistant. Nitecore came up with what appears to be a very useful system. $5500 sounds like a lot, but emergency services would throw money at it like a rapper at a stripper. If it’s high CRI and constant current instead of PWM, photographers and videographers might use it too.