By b_minul9090. Ceiling Lamp. At Saturday, October 17th 2020, 03:36:18 AM.
3. They are very big or very dim. The brightness of the lamp depends mostly on the length and thickness of the tube. By various ingenious methods of cramming longer lengths into smaller spaces, the bulbs have got brighter and smaller. These include 'U' tubes, spirals, and other shapes. While it is still true that an incandescent lamp giving the same amount of light can always be made smaller, this is often not necessary. A lampshade of sufficient size will hide the bulb. and if you are buying a new light fitting, always ask yourself or your retailer whether it will look good with low energy bulbs. In fact, low energy bulbs should automatically be provided with most new fittings these days.
2. They take a long time to come on. We are used to incandescent bulbs, which reach full brightness in a fraction of a second. It is true that they do take a few seconds to reach full brightness, but certainly not a few minutes, as early ones did. I have tested current examples by Philips, Osram, GE, Megaman, and others, and found that while the first time they are used they may take a longer time to 'warm-up', after that they reach full brightness in a few seconds. In most applications, does this matter?