Reviews-Filters for Fluorescent Lights

Hi Poppy1677, I'm from the days of analog turntables for 78 and 45 RPM audio record-players. Back then, we checked the speed of the turntable using a cardboard disk with strobe markings on it. The strobe markings would "resonate" with the coordinating rings to measure the speed. As the electrical power grid is at 60 cycles-per-second, the power is cycling through on-and-off at 120 times a second. Heavy filament incandescent light bulbs hide this on-and-off power the best, and these bulbs makes it difficult to use the cardboard disk to check turntable speed. The earliest long-tube fluorescent bulbs connected in series with each other, without a ballast, came close to going through a "totally lighted" versus "totally dark" cycle at a 120 times a second, and the cardboard disk would work to perfection in utilizing the strobing effect. Minimizing the strobing effect in light bulbs is a trade-off with energy efficiency. Some of the newer sub-compact fluorescent utilize a much better electronic ballast that greatly minimizes this effect, but at a trade off to the spectrum of the light. Once the light leaves the bulb, filters only filter out undesirable ranges of the spectrum. Filters do not change the strobing effect itself. Though, some individuals are more susceptible to the strobing effect at certain parts of the spectrum. Diffusing the light from the bulb minimizes sharp shadows that would otherwise make strobing more easily detected by many people, but the light is still going through "bright" and "dim" strobe cycles. Even with an electronic ballast, when the bulbs phosphorus coatings burn off and the anoded mercury vapor weakens, and/or the ballast malfunctions, the strobe effect often becomes visible with "walking" flickers along the spiral of the bulb's tube, usually resonating with the power grid's frequency, because even with the changing of the power frequency to around 40,000 cycles-per-second in the ballast, the power grid's 60 cycles per second is still primary. Anyways, that's how my old analog old school memory remembers it, and down through the decades, all kinds of products were marketed to solve these problems with various gimmicks that never did quite work as well as they were touted. Tadzio

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