Dendrobiums like good light at all times but they should not be kept in full sun or they may scorch. Keep them in the brightest position during the winter months to help ripen the current years stems, called canes.
This is one of the key elements that new growers often fail to provide - NO WATERING from mid November until February, if your atmosphere is very dry e.g. in a central heated home, dry greenhouse then you can mist your plants once a months to avoid over drying them or give them a good SINGLE soak every 8 weeks. The Nobile type Dendrobiums MUST have a rest from water between these dates if you want to see flowers. There is a fine balance between drying them out completely (killing them) and keeping them alive. This is due to their natural habitat in South East Asia where the winters are cool and the air fairly dry. This winter treatment is stopped in February as growth re starts and water should be applied sparingly until good roots are visibly growing from the new shoots, by June watering can given twice weekly and continued until November. This watering regime is due to the plants native environment where they would be subject to monsoon type downpours during the early to late summer with corresponding higher temperatures and humidity and cool dry winter conditions.
Since you will not be watering your Nobile type Dendrobiums during the winter you will not be feeding them!, from late March to September you should water with a half strength high nitrogen feed to boost growth and from September to November change to half strength high potash feed to ripen the canes,
Repotting and dividing should be undertaken in the spring either immediately after flowering or just as new growth starts. These plants need the roots confining and should always be under potted rather than over potted as this will help prevent over watering. These plants produce an enormous amount of aerial roots and so are ideal candidates for growing in many ways other than pots. They can be mounted on cork bark or even grown over a tree stump, they will become top heavy though but thanks to the abundance of anchoring roots should be stable by the following season after mounting.
Also available as NON Nobile types