Quote:
Originally Posted by ppppenguin
Fluorescent lighting is a very real hazard in workshops with rotating machinery. Due to strobe effects this can appear stationary or slow moving when it's not. In the UK the usual solution was 3 phase fittings or lead-lag fittings. Running tubes in sets of 3 from 3 phase increased the flicker rate from 100Hz to 300Hz which was sufficient with the phosphor persistence to solve the problem. Lead-lag fittings could be used where 3 phase wasn't available or practical. These used a mixture of L and C in the ballast to operate 2 tubes with something approaching the equivalent of 200Hz flicker.
HF ballasted fluorescents give a nice steady light and better efficiency than 50/60Hz. Now obsolete with the rise of LEDs.
Some LEDs using rectified mains have flicker that's as bad as fluorescents. Others use high frequency or smoothed DC and are safe with machinery. Then you often get radio interference from HF designs.
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All large areas that required a high degree of lighting used fluorescent light strips derived from a 3 phase source. In shopping centers and large stores, factories 480/277 was the common setup, one row of lights from each phase.
They seemed brighter from minimizing stroboscopic effect.