How to kick phal into root growth mode?

[ridethespiral]

I have two phals that I want to get going into semi-hydro but they currently aren't putting out new roots. A few weeks ago I transferred them from peat moss into a semi-hydro medium but have only been watering them as if it was a regular substrate. Not long after, I switched out the two T5HO bulbs in the fixture over my fish tank for two brand new 6500K bulbs (Holy CRAP I didn't realize how much less light the old bulbs were putting out.. It's blinding now!). The fixture is hanging 30cm above the top of the tank, and about 15" from the phal leaves.

They really seem to be loving the new medium and light. The leaves have lightened up a bit (used to be pretty dark) into a more olive colour. I can take pics if you would like to comment on how they're doing. Both of the phals have started to put out spikes. One has about a 4mm long spike emerging, the other is only about 2mm long but I can tell they're spikes. One of the orchids has an old spike that grew up into the light and burned, but is still alive from on of the nodes (about 15cm long). I'm not sure if I should cut this off and once the other spikes get a little longer, cut them off? Or trim the little spikes and apply cinnamon to abort them. There was one little new leaf growing on one orchid when I repotted them a few weeks ago which is now about 5-6cm long and shows no signs of stopping.

I've been using fish tank water and adding in the fertilizer I used to use for my aquatic plants (NPK, CSM+B) as well as another 'micro' nutrient solution made by Seachem. I tested the nitrate level of the current concentration I've been using and it appears to be about 80ppm. I eventually plan to get actual orchid fertilizer, but that's an investment I can't afford at the moment, and it seems to be working well. I also picked up a bottle of superthrive when I bought new bulbs and have been using it as well.

Now despite all of this new growth, there are no new roots emerging! How can I convince these orchids to put out new roots instead of spikes and leaves? I'd like to be able to finally switch over to semi-hydro but I won't risk it until I see a bunch of new roots coming out.

TLDR: How to convince orchids growing under T5HO bulbs for 12hrs a day to put out new roots so I can switch over to semi-hydro?