Light levels

[Kelo]

Since the net wasn't generally available when I last grew orchids I'm picking up new ideas and methods etc. from the OB. My question is this; the latitude I live at sees the sun rise at 3.30 in the morning and it doesn't really set that much at night (the sun dips under the horizon around midnight), is this amount of light detrimental to orchids health? I'm thinking along the lines of the plant not getting enough of a respiration period at night.