I was told by P**M*** (where I buy from) and A***S***. They told me that Ebalast is very elastic, it can support a varity of bulbs, even HO.
Yes, it is a remote Ballast.
Yes, they are selling the light set and ask them whether I can upgrade my set to support HO, they told me that no problem.
Even, if they showed me the light, I doubt I can tell the different, unless I have a measuring kit.
In that case, I might need to buy everything....