All plants need light to live, and this is especially true for orchids. In nature, many orchids grow high in the trees of the tropical forest where they enjoy lots of light.
Your orchids growing at home need lots of light too!
It takes energy to produce those magnificent flowers - and the only place your orchids get energy is from the sun. So if you want your plants to bloom, you're going to have to give them proper light. There's no substitute .... if they don't get enough light they simply won't have the energy to produce flowers.
The #1 reason orchids don't bloom is not enough light.
Leaf color is a good indicator to determine if your plant is getting enough light.
Orchids leaves should be bright green and rigid. Dark green leaves are a sure sign of insufficient light. They look good but the plant probably won't bloom. Bright green leaves indicates plant is getting adequate light.
Light is measured in foot candles. One foot candle is .......
You can a pretty good idea of the light level around your plants by holding your hand about 1 ft above a plain white sheet of paper, during the brightest time of the day, and observing the shadow.
High Light: The shadow is dark and well defined.
Medium Light: Shadow color is lighter and shape is fussy.
Low Level Light: Hard to see any shadow.
Orchids are generally grouped into 3 different light categories: high, medium and low light. How much light your orchid needs depends on what kind of orchid it is.
Starter orchids that require high light - shadow of your hand is well defined (or a couple of hours of direct sun every day):
Starter orchids that grow in medium light - shadow of your hand is fussy (or bright light with just a touch of sun):
Starter orchids that tolerate lower light levels - hard to see any shadow from your hand (very little direct sun):
For more on basic orchid care:
Orchid Care Basics- Temperature
this is where to start ...