Dendrobium Feeding in Spring?

[minda5]

Advice please on the type of fertiliser & when to use (if at all) in the Spring on Dendrobiums?

Here in Newcastle, UK, the daylight is now lengthening say 13 hours a day & the days are becoming warmer, especially in the orchid house. Many of the orchids are now awakening under these conditions. Some Nobile have already flowered, some (Nobile) are on the verge of flowering (say in another 10 days). Victoria-regina has hugh flower buds (say 5 days before flowers are open) & other dendrobiums canes are thinking about wakening up but no foliage yet.

I know that for Nobile, it is not even recommended that watering takes place, & certainly no fertiliser, until theorchid has flowered. So recommendations please on the type of fertiliser & when to use in the Spring on Dendrobiums? or even when commencing normal (?) watering.
The fertilisers I have are 7-9-5 (Grow) & 5-12-6 (Bloom). As far as dendrobiums are concerned the latter would be favoured by me from late mid-summer.