I’ve done the cheap ebay light vs Exposure thing now.
Used to use a couple of generic “2000” lumen versions, the type you get on Ebay for £20 with a battery. Used them infrequently (once a week in the winter) for several years, got through 3 lamp units and 5 batteries in about 4 years I guess. In pure financial terms, that’s not too bad I guess.
Then got a load of evans cycles vouchers that meant I could afford an Exposure Toro Mk8 earlier this year – what a difference! A really superb light.
I now use it multiple times a week, on both road and MTB.
Is it worth £250+ at face value? No, probably not. I would have had to got through a huge amount of the cheapie ones, but the performance difference is massive.
I see your budget is £200 ish – I think I’d go down the Exposure or Hope route if it were me.