colour of a healthy Phalaenopsis violacea leaves

[ladyslipper]

Hi guys, I have noticed a number of my plants including a Phalaenopsis violacea who's leaves are either a light green or have a "striping" of lighter green along the normal darker green of the leaves. I have double checked my lights to see if the light is too intense but it doesn't go over 2000 & in the afternoon the light may drop to 1500 & I believe this range is okay for phals & a fellow from my orchid club came by & he said either the lights are too high or I have nutrient deficiency going on likely as a result of watering with RO water only. This was echoed by Paramount as a possibility. I have upped the magnesium & calicum fertilizer through a diluted application of Mag-Pro 2-15 4 fertilzer & dissolved epson salts (Paramount suggested a bit of epson salts) when I water. It was also suggested every once & awhile a 50/50 mixture of tap & RO watering.

Question: what colour green am I looking for on Phalaenopsis violacea leaves? Someone from the orchid board said they were normally a lighter green but my new violacea has darker green leaves. Right now I am watching the new violacea as somewhat of a test object to see if the leaves are turning lighter hoping I can reverse the lightening of the leaves.

Do I infact have my lights too high? I have 2 40watt full spectrum flourescent tubes & 2 T5, I believe 40watt tubes.

Thanks for all advice & opinions - m