That’s the problem with 3×AAA lights, and if I’m reading it right this beastie takes 3×AA, no?
I got a freebie 3×AAA light just for downloading a whitepaper from some company, and admittedly, with brandy-new AAAs, it was rather bright (albeit horribly blue). But brightness decreases from second 1 with increasing internal resistance of each cell, so that with just 10-15min on the clock, it’d be noticeably dimmer when compared side-by-side vs brandy-new cells.
And how long the batteries are “good” depends on your tolerance for how dim the light would get before being driven to reload.
So yeah, those types would look at the light with brandy-new cells (included!), and of course be wowed. Harsh glaring Angry Blue™ light that still hurts to look at it if dim, would make people wince and be wowed at its “brightness”.