I heard there overrated but never used it myself personally I wouldn't use those bulbs. Site looks unprofessional to this is from there site -
Emperor’s high pressure sodium bulbs are high in this light spectrum, which simulates the fall sun. This band of light triggers hormones in plants to increase budding and flowering.
^^
doubt that plus your shop probably got them for cheap since the company is trying to get there foot in the door. So, of course they will try to push there product since it costs them less