that's more likely,its the same over here un the uk,the Phillips double ended bulbs stopped being made.hydri store friend told me its exatly that reason.they cant afford to be linked to canna,especially as its totally illegal over here.he also was the one who told me,non of the ballast bulb combination work like the Phillips 315 .they made and designed it.everything else is a copy.his words not mine guys...lol.anyway,if the Phillips de bulb,compared to gavitas own bulb are anything to go on.i agree.phillips were way better.