I'm with Justin.
They look great and the only thing that looks odd is how pale they are.
If you can, reduce the intensity of the light.
I don't see any effect of shortening the light hours.
Even if you were to give say, one hour of light, when too strong, the plant would burn or suffer otherwise.
Some of my Paphs began to look bleached when they were moved to artificial light as early as just one week!
When I moved those back to natural light or reduced the number of light bulbs, they gradually but rather instantly began to return to the "normal" level of green.