HO states for high output, well not sure I have many Malkoff units, I have M61 and M61W but they both have a bit more throw so it is hard to compare if it's stronger, but for sure not weaker, I think 219 is specific led type, Nicha it was called or something like that. I'm really not an expert and I was out of the market for few years. There were M61HO and M61SHO which were simply stronger than regular M61 but M61HO219 is a diffrent animal. I think this 219 has very natural colour rendering. My M61W for example is yelowish. Maybe someone with more knolwedge can say.