Your orchid won't flower if the light is too low. Foliage that is stunted, hard, and yellow indicates that the light is too bright. Provide an orchid with night temperatures ranging from 60 o F to 65 o F and day temps of 70 o to 95 o F. Plants grow faster in higher temperatures, but they also need more humidity and air movement when it's hot. To initiate flower spikes, provide nighttime temperatures to 55 o F for several weeks in fall. Avoid exposing plants to fluctuating temperatures as the buds develop or the buds may drop just as they are ready to open.
Good ventilation is essential.
Air movement around your orchid helps to prevent diseases. Good cross-ventilation is usually sufficient, but keep plants away from drafty, cold windows. Don't allow bark around moth orchid roots to dry completely. Nor should the plant's roots stand in water. Overwatering will rot the roots, causing the orchid to die.