First, look at the screw. The size of the screw port must conform to the lamp holder. The common ones are E14, E26, E27, E40. Except for E26(lohasled e26 light bulb), three other types are common in USA. The number after E indicates the diameter of the thread under the bulb in millimeters. E27 means that the diameter is 27 mm. Second, look at the voltage. The domestic input voltage is AC 220V, which can be purchased on the market and meets the 220V input. This is printed on the outer packaging of the bulb. A friend of mine has purchased a Japanese light bulb. I wo n’t say the specific brand. I ca n’t use it when I get it back. It can be lit by plugging in, because the voltage is too high, and the brightness of the bulb is much brighter than normal. It will burn out soon. Third, look at the color temperature. Color temperature, as its name implies, is the temperature of the color. This thing is expressed by how many K is, the higher the value is, the higher the color temperature is, the color is blue, and the color is cold. For example, at clear noon and a large blue sky, at this time, the color temperature is about 11,000K.
For another example, the morning and evening glow, red, yellow, and yellow, give a warm feeling. At this time, the color temperature is around 1800K. The lower the color temperature value, the more it tends to red and warm colors. Different color temperatures give different feelings, so you have to choose differently. Commonly, writing desk lamps use warm colors of about 3000K. The kitchen is about 4000-5000K white. Fourth, look at the manifestation. The manifestation means the color rendering index. Represents the ability of light to reflect the color of an object. The value is from 0 to 100. The higher the value, the more saturated and realistic the colors will be. There are many adulterers doing the opposite. At the supermarket’s vegetables, fruits and meat, they will light a lamp, called a fresh lamp. Common inside is half red light and half white light. Because there is more red light, the apples and meat are more red and bright. You’d better take the fruit out of the range of this lamp and see if there are any bright colors you can see at first glance. Fifth, look at the wattage. It depends on the power of the bulb. The bigger the power, the more electricity it costs.
As for how many kilowatt-hours to use for an hour, please search for the answer on Google, and will not repeat them. The greater the power, the more light (luminous flux) the bulb can emit, so in this lighting environment, the more light your eyes receive, the more intense. So, it’s not as bright as possible. The lighting industry has a set of standards that define the illuminance at different locations in the home. Such as on the floor, on a writing desk, and so on. (There are also street lighting standards on the streets), but this one needs to use an illuminance meter. People, whoever buys it, will not use it. Therefore, you can only rely on your eyes. For a long time, the eyes are not dry and tears are the best.