It looks like a spike to me as well, but it will be easier to tell once it grows a bit more.
I feed mine the usual fertiliser until buds start to form, then switch to a bloom booster (that's what it advises on the packet). Many people say that bloom boosters don't do much anyway (I'm not convinced either way) so it's probably fine to stay on the standard one all the way through if that's what you've got.
Phals don't need as bright a light as other types of 'chids. Mine tend to actually get moved to lower light when they are blooming. (Off the windowledge and onto the mantlepiece in the same room, so that I can enjoy them.) It does not seem to affect how long they bloom for (although if you do move them be careful
when they are moved, this last time I got twisted buds because I moved them after the buds were forming).