Today, Lumen has been out of the overall luminous flux. System efficiency lm/w can't really represent the true or bad of the product, because the system efficiency can only show how much light (electromagnetic wave) is generated on the parameters, and can't reflect how much is being Passed to where you really should go. So there is no good optical design, and more light will only pollute space.
In practical applications, if we deviate from the source of illumination and simply pursue total power and lumens, we will find that this is an endless black hole. LED should not be a paradise for chasing power (utilitarian). Miniaturization, more efficient optical design, and digital control are the technical advantages. In fact, we don't really need to be so bright. The greater the luminous flux requirements, the larger the illuminant, the more difficult it is to process the optics, and finally the more uncontrollable light is wasted in the space that should not appear, becoming the burden of the grid and the visual comfort.
The left and right panels (right column) explain the difference between the 9 degree angle and the 15 degree angle. The high brightness produced by the effective light on the left shows the Hotspot directly on the 5th floor. It is even more horrible that the luminaire has only 48w and the system efficiency is more than 60 lm/w. size? Slap a big one!
On the right, the façade of cover 2/3 indicates no pressure, and the clean boundary line is evenly distributed. Please ignore the X-produced unknown products on the left column and soy sauce. The light is in the air.
Drinking water source, by the way, thanks to CREE 's high color rendering XPG series chip!
Everyone knows that there are several metering methods for spot metering, average metering, and center-weighted metering in photography. Conversely, lighting is a similar classification. If you need to know the illuminance of a point under a lighting system, you can simply use:
Figure: Formula and example for calculating point illumination (Source: LUCITAG White Paper)
Note: The above formula is: the illuminance value of a point is equal to the light intensity of the luminaire in the direction of the point divided by the square of the distance from the point to the luminaire. This formula is suitable for LEDs that are close to point sources. Among them, the light intensity value of the luminaire in a certain direction can be read by the light distribution curve of the luminaire (cd/klm), and then multiplied by the total luminous flux of the luminaire.
Thus, in order for a LED chip of only 80 lm to produce a vertical illumination of 400 lux at the Jx point, the Eff value of the optical portion is critical.
Of course, there are more factors in the lighting system that affect the final effect but the parameters cannot be reflected, such as yellow circle, color separation, optical color temperature drift, etc., we will talk about it next time.
In summary, the delivery of effective light, no pollution, is a professional conduct, more important than our conveyors.
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