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The so-called brightness refers to the brightness of the light, usually expressed in lumens (lm), and is used to describe the ability of the light source to produce a visual response intensity per unit of time. A lumen's brightness is equivalent to the luminous intensity of an ordinary candle. In projection products, brightness usually refers to the brightness of the projected image. The higher the brightness, the higher the brightness of this product. 
Take the VVETIME projection mobile phone VM2 launched by the world's first projection phone manufacturer in Shenzhen Zhongyue Times, for example. This projection phone is only about the size of an ordinary smart phone, but it has a projection brightness of up to 120 lumens, which is currently the highest brightness projection phone in the world.
Before the advent of the VVETIME projection mobile phone VM2, the brightness of most projection mobile phones was only a dozen lumens, which seriously affected the user experience. However, after the projector's brightness reaches 120 lumens, the projection experience has been enhanced. The projection screen can be clearly seen during the day and in the lighting environment. It can be adapted to most projection scenarios, such as business meetings, proposal negotiations, and home theater. and many more.
However, if the brightness of the VVETIME projection mobile phone VM2 is increased, a more powerful light engine needs to be built in. As a result, the thickness of the mobile phone will increase accordingly. The body thickness of VVETIME projection mobile phone VM2 is only 14 millimeters. It is one of the world's thinnest projection mobile phones, and it can carry pockets. However, if you increase the brightness, it will inevitably lead to a thicker mobile phone, which will seriously affect the carrying experience of the product. 
Second, the best brightness of micro-projection products has a great relationship with its use environment. For micro-projection products adapted to small places, brightness is not as high as possible. Because in a certain space, the refraction brightness that the human eye can withstand is very limited. If you watch a strong light for a long time, it will greatly reduce the sensitivity of the human eye and cause damage to the human eye. Therefore, excessive brightness is not an advantage for home projectors.
The average living room and bedroom area of ​​most ordinary users is about 30 square meters, and the optimal projection size under this area is about 100 inches. The most suitable projection brightness is about 100-200 lumens, because in a limited confined space The brightness of the reflection of the light is relatively soft, basically will not cause harm to the human eye, long time watching will not feel tired. 
In fact, in our lives, the brightness of computer monitors is about 100 lumens, and the brightness of televisions is only about 200 lumens. The brightness of these two mainstream display screens is kept between 100-200 lumens. The reason is also because high brightness can cause harm to human eyes.
Therefore, for a micro-projection product adapted to use in a small place, high-luminance is irritating to the human eye, and it will affect the eyesight in the long run. However, the brightness is too low to affect the projection experience. In summary, the brightness of micro-projection products is not as high as possible.
Smart TV/box information can focus on smart TV information network sofa butler (http://), China's influential TV box and smart TV website, providing information, communication, TV boxes, smart TVs, smart TV software, etc. Answering questions.
Why is the brightness of micro-projection products not higher?
In the parameters of projection products, brightness is the most important indicator, which determines the projection definition of most products and also determines the price of the product. For businesses, brightness is an essential marketing point; for users, brightness is an important criterion for selecting products. It can be said that the brightness of the projector, just like the screen size of the TV, is the core parameter of the product. But for micro-projection products, the higher the brightness, the better? This is actually a question worth pondering. However, for the type of micro-projection products, in fact, the brightness is not as high as possible, which is mainly based on the product volume, usage scenarios and damage to the human eye and other comprehensive conclusions. Overall, the current status of the supply chain and technology, 120 lumens is undoubtedly the most suitable for projector brightness. VVETIME projection phone VM2 can project up to 150 inches, the best projection size is 60-100 inches, this size screen with 120 lumens of brightness, just suitable for home theater and conference projection needs, but also the human eye can accept the most comfortable The brightness.