I've used a plr500 for 5 hours and not run out ,although it wouldn't have got much longer ,I suppose if you have the lamp on all the time you would get less.
Never had any problems with quality, never let me down.
I don't think there's a perfect lamp for anyone , for instance I'd never have a 240 I think they are cumbersome ,but for some they are the dogs bollocks ,
Find them awkward if driving and trying to lamp .
Took everything with the 150 ,from rabbits upwards..
So have a look at every lamp you can because not all lamps suit everyone.
Remember ....if you buy at distance ,it'