Define light bulb. light bulb synonyms, light bulb pronunciation, light bulb translation, English dictionary definition of light bulb. n. A light-emitting device that consists of a gas-filled glass tube or bulb and is used inside electric light fixtures
Our physics teacher told us that the light much faster than the sound.A.travelsB.to travelC.traveledD.traveling 免费查看参考答案及解析 题目: To save electricity, please keep the light ___ when you are not using it.A.offB.outC.over 免费查看参考答案及解析 题目: 你房间的灯还亮着,你...
Energy-efficient, dimmable, and colorful, these smart light bulbs and starter kits will turn you on to the convenience of a smart home.
UV rays have higher energy than visible light rays (including blue light), which makes them capable of producing changes in the skin that create a suntan. The bulbs in tanning booths emit a controlled amount of UV radiation specifically for this reason. But too much exposure to UV rays cause...
strip lighting - light consisting of long tubes (instead of bulbs) that provide the illumination theater light - any of various lights used in a theater torch - a light usually carried in the hand; consists of some flammable substance
But it's difficult to make people change their lighting habits. First the CFLs are more expensive. They cost eight times the price of the older bulbs. Many people don't like the CFL bulb. They find it too bright. You cannot change the light of a CFL, either. ...
GE's Cync Direct Connect smart bulbs are affordable and full-featured lights that come with a wide variety of options. They're a little less bright than other smart bulbs in their price range, at 750 lumens, but they support millions of colors and different features. Without the need for...
The bulbs promise the equivalent of 75W and while we're not convinced they're quite as bright as the competition, they're still pretty good for the price. As expected, look out for the need for a 2.4Ghz wireless network as is customary with bulbs that don't require a hub. ...
The solution to light pollution is to use lower-wattage outdoor bulbs and full cutoff shielding. An electric lamp should send all its light down, not upward or sideways. Full cutoff means that no light rays from the lamp go above the horizon and that at least 90 percent of the light is...
Certainly not. 3 Although these efforts may seem small, it has provided strong support for drawing the world’s attention to the threats(威胁) we are creating for ourselves. At 100 times less efficient(效率) than the modern light bulbs(灯泡), candles would be the only choice for light ...