Grow lights can be used to supplement natural light. You can also gauge proper light levels by watching the leaves of your orchid. You want them light, grass green. If they're very yellow, they are getting sunburned. If they're dark emerald green, they are not getting enough sun.
Most orchids thrive in a warm environment.
To encourage bloom, provide a drop of about 10 degrees at night, especially in autumn and winter. The temperature should not fall below 55 degrees at night, with the ideal average being 60-65 degrees. The daytime temperature can go as high as 95 degrees, with 75-80 degrees being the ideal. Over 80 degrees gets dicey, calling for special ventilation and humidity. Nothing kills orchids faster than sitting in a pool of water.