Fascinating Color Cast Cycling under Soccer stadium Quartz Halogen Lamps
May 14, 2018 13:11:17 #
I took these pictures under the soccer stadium lighting of my granddaughter's game this past Friday night. Interesting that each of the pairs of images is only a few milliseconds apart in the time of capture. You can see the lights cycling between magenta and green light color casts. Very interesting that your eyes do not detect each phase of this color. The only post-processing involved a crop to low res for posting here and a shadow/highlight adjustment. I made no attempt to color balance because I thought it was more fascinating to see this phenomenon. I saved these as low res to make it faster to download.
May 14, 2018 13:13:54 #
tomcat wrote:
I took these pictures under the soccer stadium lig... (show quote)
I'm guessing that is the stadium lights causing that to happen
May 14, 2018 13:18:48 #
Tom DePuy wrote:
I'm guessing that is the stadium lights causing that to happen
Oh, it's definitely the lights. I'm just curious as to what the elements are in the light bulbs. Quartz halogen I am assuming because they are much brighter than those old tungsten things.
May 14, 2018 13:25:21 #
Not to hijack here, but I'm wondering if the anti flicker function on newer DSLR's have any impact in this effect.
May 14, 2018 13:55:26 #
Photocraig wrote:
Not to hijack here, but I'm wondering if the anti flicker function on newer DSLR's have any impact in this effect.
That's what it's supposed to do. There's a slight shutter delay while the camera observers a light cycle, then fires at the brightest point of the next cycle.
May 14, 2018 14:00:40 #
OddJobber wrote:
That's what it's supposed to do. There's a slight shutter delay while the camera observers a light cycle, then fires at the brightest point of the next cycle.
Still kind of interesting to me that there are two different colors
May 14, 2018 14:40:08 #
MichaelH
Loc: NorCal via Lansing, MI
tomcat wrote:
I took these pictures under the soccer stadium lig... (show quote)
I have seen a similar "effect" under Metal Halide lamps in an indoor gymnasium on the blue/green mats during a women's gymnastics meet. The Metal Halide lamps cycle through bursts of bright/dim light as the power courses through the lamps. The color of the light changes also as a result of the cycling of energy. It all happens too quickly for our eyes to notice.
May 14, 2018 14:47:23 #
I am wondering now if it's the bromine gas and iodine gas that I read are prevalent in the quartz halogen lamps. According to info from Google I browsed, bromine is a reddish colored gas and iodine is a violet color gas. That would explain the colors that I see, but does not explain why it is red one millisecond and then violent another millisecond and then back to green. Perhaps it does have a lot to do with the cycling of the electric current through the filament---some of the images were slightly underexposed; whereas some of the white shirts had hotspots and needed the Highlights slider adjustment. The green is probably the "natural true color" of the lighting??
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