On Thursday, August 23, 2012 11:28:59 PM UTC+1, The Natural Philosopher wrote:
Richard Russell wrote:

On Aug 23, 9:50 pm, The Natural Philosopher

wrote:

i can see flicker on striplights at 100hz.



That's extremely unlikely:



http://en.wikipedia.org/wiki/Flicker_fusion_threshold



"The 100–120 Hz flicker produced by magnetic ballasts is associated with

headaches and eyestrain.[5] Individuals with high critical flicker

fusion threshold are particularly affected by light from fluorescent

fixtures that have magnetic ballasts: their EEG alpha waves are markedly

attenuated and they perform office tasks with greater speed and

decreased accuracy. The problems are not observed with electronic ballasts"



"In some cases, it is possible to indirectly detect flicker at rates

well beyond 60 Hz in the case of high-speed motion, via the "phantom

array" effect. Fast-moving flickering objects zooming across view

(either by object motion, or by eye motion such as rolling eyes), can

cause a dotted or multicolored blur instead of a continuous blur, as if

they were multiple objects"

A problem I have with DLP projectors that use a colour wheel. If you flick your eyes quickly you can easily see the three colour fringes.
Simon.