Optical secrets: The mystery of the spot difference of the lamp with the beam Angle – your lighting choice may be very different!

Optical secrets: The mystery of the spot difference of the lamp with the beam Angle – your lighting choice may be very different!

We all know that beam Angle is the most basic way to evaluate the shape of light distribution. However, the same beam Angle, is the light distribution shape is the same?

Below, let’s take the 30° spot light as an example.

These are four and a half light intensity angles of 30°, we found that their light distribution shape is not the same, is my beam Angle reading wrong?

We use software to read the beam Angle information.

↑ Using the software to read the beam Angle, we found that the half-light intensity Angle is 30°, and the 1/10 beam Angle is almost 50°.

For the convenience of comparison, I took four to go light flux are fixed in 1000 lm, its maximum light intensity is respectively 3620 CD, 3715 CD, 3319 CD, 3341 CD, big and small.

Let’s put it into the software and run a simulation to see how it compares.

↑ Simulation and comparison found that the middle two light spots are very clear. Light distribution 1 and light distribution 4, the edge is relatively soft, light distribution 4 is particularly soft.

We’ll match the light against the wall and look at the shape of the light spots.

↑ Similar to the ground spot, but the edge of light distribution 1 is harder, light distribution 2 and 3 appear obvious stratification, that is, there is a little sub-spot, light distribution 4 is the most soft.

Compare the uniform glare value of the luminaire UGR.

↑ Click on the above figure to see the larger picture, found that the UGR of light distribution 1 is negative, the UGR value of the other three light distribution is similar, negative mainly because the light distribution of the upper half of the light is more, the background brightness will be higher, so the calculated UGR logarithm is negative.

Conical diagram comparison.

↑ The center illumination of light distribution 2 is the highest, the light distribution 3 times, the light distribution 1 and the light distribution 4 are similar.

The same is 30°, the spot effect is very different, that in the application, there should be a difference.

Based on luminous flux, maximum luminous intensity, and spot transition.

Light distribution 1, the light distribution may not be as high as the other three, but the anti-glare effect will be better, suitable for use in some indoor Spaces with higher anti-glare requirements, and can also be used in the exhibition environment.

Light distribution 2, suitable for high light efficiency projection lamps, various sizes of power projection lamps, such as landscape lighting, or long-distance projection.

Light distribution 3, the effect is similar to light distribution 2, the same can be used in outdoor lighting, used to shine the tree crown, or a large area of long-distance light, but the secondary spot needs to be repaired.

Light distribution 4 is a more conventional indoor light distribution, which can be used for basic lighting and key lighting of normal indoor space, and can also be used for track spotlights to display lighting of goods.

It is not difficult to see from the above, although the beam Angle is the same, but the shape of the light distribution can be varied, different shapes can not be used in the same space, the effect is huge difference, so when choosing the lamp, you can not simply look at the beam Angle luminous flux, but also look at the shape of the spot, if the shape of the spot can not understand how to do? Then you have to use simulation software, typical is DIALux evo, widely used in the industry, high recognition.

from Shao Wentao – Bottle sir Light