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

7 posts / 0 new
Azirine
Offline
Last seen: 6 days 14 hours ago
Joined: 12/06/2021 - 22:59
Posts: 94
What is 200,000 cd + 200,000 cd?
<350,000 cd
≥350,000 and <400,000 cd
400,000 cd
>400,000 and ≤450,000 cd
>450,000 cd
Azirine
Offline
Last seen: 6 days 14 hours ago
Joined: 12/06/2021 - 22:59
Posts: 94
Bekebe
Offline
Last seen: 2 months 2 weeks ago
Joined: 03/04/2022 - 05:52
Posts: 5
Location: usa

400000

Xandre
Offline
Last seen: 2 hours 21 min ago
Joined: 03/06/2011 - 07:02
Posts: 542
Location: South Germany

No need for a poll

Unheard
Offline
Last seen: 11 hours 54 min ago
Joined: 01/16/2019 - 11:38
Posts: 2500
Location: Germany

Is this in preperation of the Indiana Candela Bill?

Smile, you cannot kill them all.

Yokiamy
Offline
Last seen: 10 hours 29 min ago
Joined: 10/18/2016 - 15:47
Posts: 3199
Location: Netherlands

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
Offline
Last seen: 8 hours 52 min ago
Joined: 03/09/2016 - 15:24
Posts: 2250
Location: Ohio

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.