Very powerful but limited autonomy

I would temper the rave reviews about the lamp.
So yes it is powerful, yes it is solid.
By level against autonomy is really limited, well below besides the 8:00 advertised on the packaging (and I use the brand batteries). It is expensive batteries, it must turn to the rechargeable, which requires a new investment.
With a price roughly equivalent, I prefer the rechargeable Varta projector, certainly more heavy and bulky, but with a range of over 10 hours ...