勒克斯vs Lumen
Lumen和Lux是SI单元系统中的两个光度单元。它们彼此紧密相关,并以简单的语言来衡量光源在两个不同的情况下的明亮源出现。这些测量在光源和光强度起作用的情况下很重要。
More about Lumen
Lumen is the SI unit of the luminous flux, which is a measure of the total amount of visible light emitted by a source. It is the perceived power of the light from a source. The lumen is defined as the luminous flux emitted by a light source of one candela of intensity over a solid angle of one steradian.
Therefore,1lumen(LM)= 1CD/SR.
In simple, if a point light source emits one candela of luminous intensity through a solid angle of one steradian, then the total luminous flux into the solid angle is known as a lumen. This is a measure of the total number of packets (or quanta) of light produced by a light source.
投影仪的光输出通常以流明为准。同样,灯光等照明设备通常用其光发射的光输出标记。在某些国家 /地区,这是法律要求的。
关于勒克斯的更多信息
Lux是SI的照明测量单位,即在单位表面积上的总发光通量。这是对入射光照亮表面的程度,并表明人眼对光强度的感知。LUX定义为单位面积的流明数量。
Therefore,1 lux=1lm/m2
In this definition, the effect on luminous flux by the spread in an area is taken into account. Therefore, the illuminance is inversely proportional to the area (illuminance obeys inverse square law).
Consider a light source with a luminous flux 100 lumens at 1 meter distance from the source. At 2 meters away, the luminous flux is the same, which is 100 lumens, but the area over which the light spread has changed. Therefore, the illuminance at 2 meters is one fourth of the value at 1m, which is 25lux. Further away the illuminance is even lower.
因此,照明对传感器,相机和其他需要最低亮度才能正常运行的设备非常重要。在大多数设备中,在产品上测量并注明了这些关键数量的流明数量。
Lumen vs Lux
•管腔是发光通量的量度,定义为从一个烛台的光源,通过1 seltadian的实体角度来源。
• Lux is the measure of the illuminance and is defined as the number of lumens per square meter.
•Lumen测量来自发光功能加权的光源的光(光子输出)量,以说明人眼的灵敏度。
• Lux measure how bright a light appears. Lux takes into account the spread of light over an area.
•如果从一个固定的来源,测量腔的数量s stays constant, and the number of lux decreases over the increasing distance.
Dean Alvarez说
Stupid answer; in layman terms, which is brighter and puts out more light 100 lux or 100 lumen? Simple question for Christ’s sake.
杰瑞亚琛说
简单的问题阿尔瓦雷斯先生?答案是什么?
Jeff Roquemore说
根据定义,外行不寻求理解定量的光度比较。但是,可能会尝试这样做。
Janet Greene说
这取决于所在的区域的大小,因此不能将其列为包装上的值,除了说平均大小区域(例如10×10的房间)。流明是光的实际输出。因此,鉴于它在同一区域进行了测量,因此250流明的手电筒将为250勒克斯。我认为正在说什么。
Francis说
Your “simple question” is not so simple. It’s comparing 100 oranges to 100 apples.
流明是绝对值 - 这是光源(灯泡)发出的光量,因此100流明是100流明,无论您距离灯泡5英寸,还是10英尺远。
Lux是从光源到达您的亮度 - 您对灯泡的看法有多明亮。因此,放入台灯的灯泡可能会给您500 lux,但在15英尺高的客厅天花板的天花板灯中使用的灯泡会给您带来不到20勒克斯的量子,这是您正在阅读的杂志上沙发。
So, your question of which is brighter cannot be answered. Lux measures brightness (which varies with where your stand); lumens measures absolute energy output, which has nothing to do with brightness.
Jeff Roquemore说
A better question may have been relevant to a specific distance of projection. What is the impact of lumens on lux and how does that change with distance? And how might that change with bulb type and / or color of light? LEDs are white..for example: Given 2 bulbs with nearly identical steradian measurement…Would a 900 lumen incandescent bulb produce more or less lux than a white LED bulb projected on the same surface from the same height at a given distance: 10′, 20′, 30 feet away?
Arthur Runyan说
So, how do we compare when trying to decide which projector to purchase? Projector A advertises 3800 lumens; projector B advertises 2400 LUX. First off, how can projector B even know the LUX if it does not know how far I plan to put the projector from the screen? When they advertise LUX, how do I know what the area of the projected image is and how far away the screen is for the number they give. How can I make an informed choice when some advertise their Lumens and others advertise their LUX. (Generally, I figure if they advertise LUX and not Lumens, they are trying to hide something.)
Cesar说
有人可以帮我这个实践的例子吗?- 投影仪的宣传为5,000流明,并在200英寸的屏幕上有5.5米的屏幕上的良好图片,而另一台投影仪则为5,000 Lux广告,最大投影在300英寸的屏幕上为6米 - 因此,哪种产品会更好,哪个投影仪可以提供良好的图片在低光条件下?
Gary Fannell说
塞萨尔(Cesar),将投影仪规格抛出列表lux的规格。投影仪的评分不高。
if your starting from scatch, buy a good quality projection screen that has none or less than 0.9 gain. Is tab-tensioned (keeps the screen flat). Keep ambient light off the screen. the darker the room the better your apparent contrast ratio will be (picture will look better).
您还需要找出投影仪的分辨率,使用HDR(超高防御)的4K与1920×1080(称为Full HD)的未来证明。我喜欢激光投影仪,它们更安静,不需要更换灯泡(花费$ 100- $ 400),并且通常不需要任何维护。使投影仪专业安装,以便安全地坐在并正确设置下。寻找已通过ISF认证的安装程序,并使他们向您显示认证。
that’s a fairly simple break down. good luck
Randy说
加里,谢谢!我认为您给像我这样的“外行”给出了最明确的答案(我认为塞萨尔,迪恩和杰里上面)不想或不需要理解“定量的光度比较”(…杰夫),但谁只是想尝试根据卖家提供的信息弄清楚要购买的投影仪。
Joe说
就像在汽车马力中是一个扎实的事实。MPG受速度的影响,上坡或下坡以及其他因素?
比巴说
from ‘play store’ download one of the apps that has a tool for measuring LUX into your smartphone. lunch the app and turn on one of lights in your home. face the smartphone towards the light source in close range. read the lux value. walk back from the source at .5 m intervals each time reading the value of lux.
尽管源灯的“管腔”保持恒定(对于某些灯光,您必须等待几分钟才能达到最大值),随着距离的增加,“ lux”会减小。