Do not buy Plusrite if you want long life, it seems for every one lamp that lasts over 10,000 hours, three will only last under 5000 hours. Now I cant say this is true for their lower wattage HPS as ive only used their 250w and 400w HPS lamps in large quantities, but assuming quality is the same across all sizes, ide invest the few extra bucks in EYE Iwasaki. And dont even get me started on Plusrite MH lamps...
Luxrite is most likely rebadged Plusrite, or possibly an even cheaper made chinese export like Caster/PolarLites