Somewhere I think I have a photo of the Salvo 21W shining down my garden with the Nautilus next to it. The Salvo looks like a very very dim candle in comparison.
An extreme version of Graham's point is a video light- it might chuck out 8000 lumens but any more than stuff a couple of metres away isn't lit as the light needs focussing. Better a well engineered, well focussed dimmer light than a Chinese lumen monster that fires everywhere apart from where you want it, then melts your bag when you put it away, assuming the 18650 charger hasn't set fire to your house first.
That's why proper underwater video lights like Keldans are eye wateringly expensive.