The goniometric diagram to the right represents the center of the light, and shows how much light is coming out/in what direction; from it, we can observe the radiant intensity. To rephrase, we can see goniometric diagrams as a depiction of the fraction of light that is reflected as a function of relevant angles/directions.
frankieeder
In practice, it seems like this would be easier to visualize in 3 dimensions instead of just with our spherical coordinate parameters. Do these types of 3d diagrams (that describe light intensity) exist, and are they practical?
nebster100
Poul Henningsen is a super cool figure! His primary focus wasn't even art, design, or lighting, he was actually a writer. But he ended up making an impressive and beautiful contribution to interior design. https://en.wikipedia.org/wiki/Poul_Henningsen
wangcynthia
Just wanted to double check —the center point of the concentric circles represents the light source and the numbers down the middle of the diagram show how much emitted light is at that point in cd/klm? And the space above the light source doesn't show any light because it's covered by the top metal part of the lamp?
tristanburke
Follow up on Nebster100, it turns out Poul Henningsen's Artichoke lamp was actually created in the hopes to reduce glare and achieve a "uniform" light.
tristanburke
Follow up on Nebster100, it turns out Poul Henningsen's Artichoke lamp was actually created in the hopes to reduce glare and achieve a "uniform" light.
Michael-hsiu
I wonder if a single light source can achieve the same goniometric diagram; perhaps refraction from the overlapping light sources are able to spread out the angles of radiant intensity, which might not be possible if just using a single light source. I also wonder why the tip in the diagram is slightly extended downwards, when the physical form is rounded on the bottom.
bbtong
@tristanburke, that's really cool! It also explains why I've mainly seen these artichoke lamps featured with super warm lights (they end up looking like pine cones to me...) - it's really soft, uniform, warm light.
bbtong
@Michael-hsiu (hello!), I think the there is a tip at the bottom of the diagram due to there being no plastic diffuser at the bottom. Thus, the lightbulb is pointing straight downwards plus there is no diffuser, so it is the strongest path of intensity.
hilary217
How does the metal board inside the lamp affect the intensity of light at each direction ?
The goniometric diagram to the right represents the center of the light, and shows how much light is coming out/in what direction; from it, we can observe the radiant intensity. To rephrase, we can see goniometric diagrams as a depiction of the fraction of light that is reflected as a function of relevant angles/directions.
In practice, it seems like this would be easier to visualize in 3 dimensions instead of just with our spherical coordinate parameters. Do these types of 3d diagrams (that describe light intensity) exist, and are they practical?
Poul Henningsen is a super cool figure! His primary focus wasn't even art, design, or lighting, he was actually a writer. But he ended up making an impressive and beautiful contribution to interior design. https://en.wikipedia.org/wiki/Poul_Henningsen
Just wanted to double check —the center point of the concentric circles represents the light source and the numbers down the middle of the diagram show how much emitted light is at that point in cd/klm? And the space above the light source doesn't show any light because it's covered by the top metal part of the lamp?
Follow up on Nebster100, it turns out Poul Henningsen's Artichoke lamp was actually created in the hopes to reduce glare and achieve a "uniform" light.
Follow up on Nebster100, it turns out Poul Henningsen's Artichoke lamp was actually created in the hopes to reduce glare and achieve a "uniform" light.
I wonder if a single light source can achieve the same goniometric diagram; perhaps refraction from the overlapping light sources are able to spread out the angles of radiant intensity, which might not be possible if just using a single light source. I also wonder why the tip in the diagram is slightly extended downwards, when the physical form is rounded on the bottom.
@tristanburke, that's really cool! It also explains why I've mainly seen these artichoke lamps featured with super warm lights (they end up looking like pine cones to me...) - it's really soft, uniform, warm light.
@Michael-hsiu (hello!), I think the there is a tip at the bottom of the diagram due to there being no plastic diffuser at the bottom. Thus, the lightbulb is pointing straight downwards plus there is no diffuser, so it is the strongest path of intensity.
How does the metal board inside the lamp affect the intensity of light at each direction ?