Are the lights for supplemental lighting, or the main light source for the plants? What sort of orchids do you grow under them.
I have a collection of mostly Phals, and have LED grow lights that I use as supplemental light from late fall to early spring.
The first ones I got were Secret Jardin TLEDs (
TLED Archives - Secret Jardin) which were for my Neofinetia in the winter. I have a 'bloom' and 'grow' and honestly don't see a difference and now use both on the same shelf. The advantage of these is that they are plug and play.
Last year I bought some Sanlight Flex strips
SANlight FLEX-Series - flexible LED grow light ~ SANlight) and I'm really happy with how the Phals grew over the winter. I saw lots of roots, and good leaf growth. I had one light per shelf, approximately 15cm above plant canopy. For higher light plants perhaps 2 lights per shelf are necessary. Note that the power supply and cords to daisy chain them together are sold separately. One power supply is good for 60W of lights (so 3 flex20 or 6 flex10).
Cost wise, the large versions (90-95cm suitable for most standard shelves) cost 75-90€, and for the Sanlight you need to add the power supply to that.