I'm growing one warm in near vanda level light and has been doing fine but no spike. The other is spiking at mine on the windowsill in phalaenopsis level light. I bought it in the hopes I could keep it on the windowsill and I think it will do well even with phalaenopsis level light, just bought the plant last year and already 7 buds on its first spike developing - I know this plant likes to put on a show but I am very happy with how it is doing in a west facing window.
I always use this site to check for care information and the temperature and light information seems to be accurate from my experience.
Sedirea japonica care and culture | Travaldo's blog
Its says 1800-2500fc but it can handle up to 3500 I would guess, whether that is why the other isn't flowering is hard to say but it is most likely just not mature enough