At present, the price of a laser projector is relatively high, but the number of people who can't stop paying attention is large. Its super large screen has the advantage of LCD TV, but at the same time, many people still don't understand what the core indicators of choosing a laser projector should be? Let's talk about it today.
Lumen or nit for brightness performance
Brightness is the most important factor for the laser projector. At present, there are two kinds of units in a laser projector, one is lumen and the other is a nit. Traditional projector manufacturers use lumens as the nominal brightness, while some LCD TV brands like a nit. Which luminance unit should be used in the field of laser projector?
Lumen (LM) is a unit of luminous flux, which represents the amount of radiant light energy per unit time. It is generally used to measure the brightness of objects that do not emit light but reflect light. For example, the brightness of home theatre projectors is basically more than 1000 lumens, while that of laser TVs is basically more than 2000 lumens.
Brightness refers to the degree of light and shade of an object, which can emit light by itself, such as various light bulbs, various light sources, including TV LCD, which is defined as the luminous intensity per unit area, and its unit is nit (NIT), 1nit = 1 candela / m2. At present, the brightness of many mobile phones has reached a level of more than 400 nits.
What is the relationship between lumen and nit? In fact, the relationship between the two is light energy and the luminous intensity per unit area. The lumen can be compared to a flashlight. If the luminous energy has been determined, the smaller the area, the higher the brightness. The larger the area, the lower the brightness. 1 nit = 0.093 lumens / square foot. Suppose a projector with 1000 lumens has an area of 1 square meter (more equivalent to the size of a 60 inch LCD screen). At this time, the brightness of the projection picture you see is about 100 nits.
That is to say laser projector lumen is fixed, but the same projector can have different nit brightness. The smaller the picture size of the projector, the higher the nit brightness of the picture, but the lumen brightness does not change. Because lumen is a value of illuminance multiplied by area. If the area is large, the illuminance value will be low, so the result of multiplying illuminance by area does not change. (the projector screen can not directly measure the lumen, only the illuminance can be measured by the illuminance meter, and then the final lumen value can be calculated according to the area value).
After understanding the relationship between lumen and nit, we can understand that in fact, nit should not be used in laser TV, because it can project a variety of sizes. A laser TV can project 80 inches or 100 inches. When it projects these two dimensions, the nit value of the picture must be different. Therefore, it is not accurate to use nit to name a laser TV.
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