Qualm entered English in the 16th century, with meanings like doubt and uneasiness.. Usually a qualm comes from doubt about an action and a feeling that you are doing, or are about to do, something wrong. It isnt a bad feeling about another person's behavior but about your own.
The newest type of grow lights use LED technology. One major advantage to the LED lights is the small size. LED lights are only a few inches in diameter and are easy to mount. In some greenhouses, LED lights may be the only practical light option.
Light Requirements for Orchids. The single most important variable when growing orchids indoors is light. Orchids that prefer high light -- unobstructed sunlight, streaming through a clear, south-facing window or into a greenhouse for 6 to 8 hours -- include vandas and angraecums.