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Author Topic: Colour of light matters  (Read 11738 times)
Iliah
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« Reply #160 on: July 12, 2013, 02:06:42 PM »
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Before you leave, is my point with FL lights clear?
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xpatUSA
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« Reply #161 on: July 12, 2013, 02:37:01 PM »
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Before you leave, is my point with FL lights clear?

My understanding is that you're telling the forum that setting the shutter period to more than the flicker rate of the lamps is bad practice.

TTFN,
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best regards,

Ted
Iliah
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« Reply #162 on: July 12, 2013, 02:39:15 PM »
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One can use 1/30 (not always practical), 1/60 (may be too long as well), or 1/120.
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xpatUSA
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« Reply #163 on: July 12, 2013, 04:38:24 PM »
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One can use 1/30 (not always practical), 1/60 (may be too long as well), or 1/120.

Indeed one could. You said "FL lights". Would your advice apply also to modern lamps with electronic ballasts?

From Wikipedia:
Quote
Fluorescent lamps using high-frequency electronic ballasts do not produce visible light flicker, since above about 5 kHz, the excited electron state half-life is longer than a half cycle [citation needed], and light production becomes continuous. Operating frequencies of electronic ballasts are selected to avoid interference with infrared remote controls. Poor quality (or failing) electronic ballasts may have insufficient reservoir capacitance or have poor regulation, thereby producing considerable 100/120 Hz modulation of the light.

(my bolds)
« Last Edit: July 12, 2013, 04:42:35 PM by xpatUSA » Logged

best regards,

Ted
Iliah
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« Reply #164 on: July 13, 2013, 12:46:36 AM »
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> Would your advice apply also to modern lamps with electronic ballasts?

If one can't check the lamps operate at high freq. - yes.
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