that would actually be the perfect thing for you. well, i dont want to say 'prefect', but it will give you more lighting, it will be cheap, and if you dont like it, its not like you spent a fortune.
you can teally see from the pictures (it just looks bright), but what kind of bulbs are those? if you get the HM to replace two of your bulbs, youll 'probably' want to have the PC become deep actinics, and your mh A 10k. i know i like blue-heavy lights though, so i use actinics with a 14K, but thats just me.
so, enough of me droning on and getting side-tracked
what sort of bulbs were you thinking about, or dont you know?