Dendrobium culture: Observations on the color of the mature canes in some Dendrobium species when exposed to strong light

Many Dendrobium need high light to bloom at their best, but the way they respond to it varies depending on the species.  My Den. nobile blooms with larger flowers with richer color when the canes are getting so much sun that they take a yellowish tint.   On the other hand, the Dendrobium primulinum from Laos produces larger flowers when the canes are exposed to full sun and turn purple.    Den anosmum doesn’t change color too much even when exposed to full sun, perhaps the canes are just a bit lighter green color.  I haven’t noticed a color change in the canes of Den devonianum, but the flowers of my plant which is exposed to full sun for hours in the morning show very pale color in the sepals and petals, so pale that it can make one think the flowers are not of devonianum unless one looks closely.  My newly acquired plant of Dendrobium ceraula shows a deep purple tint on the side of the cane that receives the sun and green on the side that is under the shade of the leaves.  In my experience Dendrobium cucullatum becomes yellowish and stunted if exposed to too much sun.