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.
Fluorescent lamps-These have the advantage of higher light efficiency with low heat. This type of lamp is the most widely used for supplemental light. It is available in a variety of colors but cool-white lamps are the most common.
There is some confusion about this because compact fluorescent light bulbs (or CFLs) have typically been referred to as 'low energy light bulbs' by retailers. However, the reality is that there are a number of different kinds of low energy light bulbs available, including CFL and LED light bulbs. Just to make things more confusing, some rather inefficient lighting products, such as traditional incandescent and halogen bulbs, come in 'low energy' versions.