Plus other road users are going to love you with that on your bike!
I don't ride on the road. Roads are for cars
LGF, That's the Trout Mini you have quoted, the liberator is 2000 lumen with a 3 hour run time. P7s are good but unreliable and the spread of light is poor- that's why you need 2 or 3 up front. You don't want to get caught out with no lights where I ride on a night, it's bad enough with lights.
Over the last month we have had 2 airlifts- one suspected broken back and a broken leg, a broken finger and an impailment. Add to that my two broken ribs and a fractured wrist and then consider the loss of income whilst these things are fixed, 250 on a powerful and reliable light makes good sense.
You would not scrimp on bike or helmet when riding big stuff so why scrimp on lights??
Not riding at night would make more sense than wasting £250.