What is 200,000 cd + 200,000 cd?

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Azirine
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What is 200,000 cd + 200,000 cd?
<350,000 cd
17% (4 votes)
≥350,000 and <400,000 cd
13% (3 votes)
400,000 cd
71% (17 votes)
>400,000 and ≤450,000 cd
0% (0 votes)
>450,000 cd
0% (0 votes)
Total votes: 24
Azirine
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Bekebe
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400000

Xandre
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No need for a poll
or an extra thread

Unheard
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Is this in preperation of the Indiana Candela Bill?

Smile, you cannot kill them all.

Yokiamy
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What i am missing from the discussion is any reference.
Yes, 200k +200K is obviously 400K, but theoretically candela is measured perpendicular.

You simply cannot measure two flashlights and get a double Cd reading in a perpendicular way. You can either get double the Cd value, while not measuring perpendicular, or you can get a higher value (but not double the Cd) by measuring perpendicular.

EasyB
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Yokiamy wrote:
What i am missing from the discussion is any reference.
Yes, 200k +200K is obviously 400K, but theoretically candela is measured perpendicular.

You simply cannot measure two flashlights and get a double Cd reading in a perpendicular way. You can either get double the Cd value, while not measuring perpendicular, or you can get a higher value (but not double the Cd) by measuring perpendicular.

Two flashlights pointed at the same target will double the lux on target, which is the thing we really care about.

This question originally is talking about two flashlight heads right next to each other pointed in the same direction. In this case the candela is essentially doubled because at a far distance it is equivalent to coming from a single flashlight source. On the other hand, if the two flashlights are far from each other and pointed at the same target so the beams make a larger angle, say 45 degrees, then your consideration of perpendicularity becomes important. At only that target the lux is doubled, but any other target the beams don’t intersect. I think this addresses your question. In this case the candela is not doubled.