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<blockquote data-quote="nickt" data-source="post: 255080" data-attributes="member: 4923"><p>I've been thinking about florescent and LED lights for awhile. I don't have the shooting experience to say anything firm on this and I have not read much. But don't florescent lights flicker? The phosphors have a bit of afterglow to even things out a bit, but they are still pulsed and I'm sure their brightness varies over the power cycle. Older lights pulsed with the line frequency. 50 or 60hz, so they are without power 100 or 120 times a second. The phosphors keep them glowing during the off period, but I have to think it drives auto white balance and metering crazy. Newer electronic florescent ballasts can speed this flicker up into the khz region, so less noticeable and less likely to drive sensitive people crazy in schools and offices. Newer lights might be less problematic for cameras too. LED lights have even greater potential for problems. Depending on the power supply, they can be rock steady or with a very simple power supply, they vary from full on to full off at twice the line frequency. If they are controlled by a fancy dimmer, the frequency can be anything. We know florescent and LED lights can make our videos crazy, why not cause inconsistency between still shots?</p></blockquote><p></p>

[QUOTE="nickt, post: 255080, member: 4923"] I've been thinking about florescent and LED lights for awhile. I don't have the shooting experience to say anything firm on this and I have not read much. But don't florescent lights flicker? The phosphors have a bit of afterglow to even things out a bit, but they are still pulsed and I'm sure their brightness varies over the power cycle. Older lights pulsed with the line frequency. 50 or 60hz, so they are without power 100 or 120 times a second. The phosphors keep them glowing during the off period, but I have to think it drives auto white balance and metering crazy. Newer electronic florescent ballasts can speed this flicker up into the khz region, so less noticeable and less likely to drive sensitive people crazy in schools and offices. Newer lights might be less problematic for cameras too. LED lights have even greater potential for problems. Depending on the power supply, they can be rock steady or with a very simple power supply, they vary from full on to full off at twice the line frequency. If they are controlled by a fancy dimmer, the frequency can be anything. We know florescent and LED lights can make our videos crazy, why not cause inconsistency between still shots? [/QUOTE]

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