Cymbidium and Dendro questions

[Shiffdaddy]

There was just a forum that had almost my exact question, which was good. It was my cymbidiums get a good amount of sun from about 11-5 they get 85 degree at the most sun. They are a nice yellowish green color (not burned at all). My question is when is yellow too yellow for a cymbidium? Is there a point where i should move them into less sun for a few weeks?

Question 2: Do cymbidiums send out new flower stalks from old bulbs or the new growth thats coming in? Or both?

Question 3: I recently received a very large dendrobium from a buddy of mine and it was just about to open a few flowers. They opened and were really kind of.. not good looking.. lol. There is a ton of potential its like Yellow all around the outside and a purple/blue/violet color in the middle. Could the lack of color be from a fertilizing problem or a light problem? Or is it bad genetics?

To add.. the dendrobium had aphids so i seperated it from everything and gave it a good amount of aphid killer. From what i can see most of the aphids are dead. Could this add to the ugly flowers?

Thanks guys, always love reading all the responses so any info is much appreciated!