In the first part (www.drive2.ru/o/b/459345997466765265/) there was a story about HOW we do it.
Now the total theoretical part, our products are only an illustration. In this part, a few words about what it's about.
The first word is not quite decent at first glance — "goniophotometer".
It's not what you think, and is big enough for such a device for measuring angular characteristics of the environment. Of course, professionals 89lvl used for the accurate measurement of the sewer pipe and the foil from a chocolate "Alenka", but we are not yet at the stage of enlightenment, so we use classical physics :)
So, here, showed the Shaitan-device in 3D
This distribution of intensity in space.
Probably not very clear, but roughly the point in the figure is the direction of radiation, and the color is the relative luminous intensity in this direction.
Red zone, for example is the main beam where the intensity is maximum. Beautiful.
Further, in order to evaluate more concretely, let's go "on a plane" where all the fun is.
First, the distribution WITHOUT a lens.
HLP is not Crossfire with the latest drivers and all settings return there with optics 640 lumens as I remember. Without optics anymore.
The distribution obtained is:
In reality coincides with the light distribution of led chips without optics (dataseta find the same chart).
One problem — not enough light.
Who remembers the technical regulations for DRL need 400 candelas within the angle of 40 degrees (+20 / -20).
Here without optics the light intensity does not hold up to 200. 185 somewhere candelas at the center.
If you put in the reflector, it will be better, but who remembers, reflectors, turn signals/dimensions of the cars have fairly wide angles, so added not so much — 30-50%, but hardly more.
As you can see "stupid lumens" absolutely not guarantee us that their emitting module in the headlight "stacked" in the technical regulations. So we can safely say that, for example, Chinese "plug-in" DRL without any optics, even if they give you 700 lumens, the new standards do not fit in any way. Will Shine weaker than necessary by about HALF.
The same story about the modules with the super-duper scattering optics, which, like, illuminates the reflector. Much light it back not turning on from high school physics understandable reasons, but will Shine in all directions. In the end, we will probably have a good fill, but the intensity of the light in the zone (+20 -20) degrees will be about anything and to the right according to the regulations, 400 Candela does not make it. Here, these measurements'm going to put :)
In the end, we need optics that will "collect" the light in the right "zone DRL" and give good lateral flare "reflector" to comply with the terms of the technical regulations area.
Put our lens on the same module we get quite a different picture:
Under 300 candelas in the required sector of +-20 degrees. Growth is not bad, considering that a good lens holds a decent enough part of the world. Not a very good delay a naughty part :)
The rest you get from the reflector, the total received from 430 to 480 candelas depending on the structure of the reflector.
So the moral of the story:
1. If you want to meet at least at the lower end of the technical regulations WITHOUT optics, you one of your light bulb should give about 1400 lumens of light if all the chips in the end, if part of the sides, then even more;
2. Scattering optics of the situation is not correct, need focusing. Rather the hybrid, as we do :)