Anette what type of light did you obtain? There are many different types of grow lamps. Are you planning on growing only under light or plan on using it as a supplement for natural light?
One does not have to stimulate sunrise and but varying the length of day at different times of the year helps with some orchids. Typically on for 16 hours is the norm. Distance away from bulbs vary with types of bulbs. I grew under a bank of 4 fluorescent bulbs for a period of time. Here are a few articles worth reading.
Growing Under Lights
Growing Orchids Under Lights
Comprehensive Culture Guide—Light levels for growing orchids
Orchids Need Light to Bloom | River Valley Orchidworks