Supplemental fluorescent light
There they will be exposed to much higher light intensity , natural rainfall, and fluctuating temperatures that can promote flower bud initiation. In the summer you can consider moving your plants outside. Supplemental fluorescent light in a window may be all you need to provide sufficient light for your orchids to flower. Special grow lights, or four fluorescent orchid delivery service tubes placed 6 inches apart side by side and placed 6 to 8 inches above the plants, set for 14 to 16 hours a day should be sufficient for low light-requiring orchids. If you don’t have adequate light or space by your windows, you can always use artificial light. Just like tender, unconditioned human skin, the leaves can be sunburned, first bleaching out to white, then dying and turning black.
