Anything over 6,000 or so lumen is going to require active cooling, so there goes any chance of a low price.
Lower powered lights like the PowerTac X10000 Destroyer or X10k cost $700 and thats only 10,000 lumen.
The Microfire Challenger H5 was 5,000 lumen and cost about $475.
I think the light closest to 25,000 lumen and lowest in cost is the imalent R90C at about $400.
I did a thread on a lot of active cooled lights here if your interested. It’s not up to date, though. Imalents newer lights are not on there.
Very few lights use external power. I remember the old Olight X6 Marauder, but it was only 5,000 lumen and $400.
Any light capable of 25,000 lumen for just 1 hour is going to require a massive amount of battery capacity. It would almost have to be externally mounted. The only real application I could think of for the light you’re describing would be some type of search and rescue. This is a specialty application so it would be well beyond and above any type of reasonable cost. Not at all something the average flashlight user would need or could afford. It sounds like something a city’s Fire Department might use and a city can afford to pay the big bucks for a specialty light.