What does the color of a birthday candle mean?

Red birthday candle represents 10, blue birthday candle represents 5, white birthday candle represents 1


Birthday Candles In many parts of China, people like to light candles on their birthdays. In ancient times, candles used for birthdays were larger in s.......

Demystifying the cause of light decay of LED lamps

The lamp that I just bought is very bright when used. After a long time of use, the brightness of the lamp slowly becomes low until it is finally extinguished.

We all know that this is the life of the lamp is slowly shortening, and when it is not lit up one day.......

Lighting conditions are too good and easy to myopia?

More than 30 years ago, primary and secondary school students wore very few glasses, especially in the countryside, where glasses were rare. Today, there are still fewer children wearing glasses in the country. According to statistics, the proportion of middle school students in urban myopi.......