![]() We have strip LED under-cabinet lighting in the kitchen and we have been very pleased with it. I need a higher-output fixture to ensure adequate lighting for task work. I am considering mounting a single 3- to 4-foot LED fixture to light up the sink area and counter, but I am concerned about how well LED performs in cold temperatures - say, between 35 and 60 degrees. The garage is insulated and the nighttime temperature does not go below freezing, but tends to hover between 35 and 40 degrees during sub-freezing weather. I recently installed a countertop and sink under an existing overhead cabinet in my garage. Q: I have a question about the ambient air temperature sensitivity of LED under-cabinet lighting. Related Question About LED Under-Cabinet Lighting That one is specially made to dim LEDs and fluorescents. Or you can use a dimmable fluorescent using a cord dimmer, such as the Lutron Credenza. Both MaxLite and Litetronics make a three-way fluorescent bulb, giving you three levels of illumination as you turn the switch. If you’re using halogen to get more light output, consider a compact fluorescent. So I do believe that there is a greater likelihood of shade material catching on fire if it is lamped with the comparable-wattage halogen, but more likely the halogen lamp will more quickly degrade the shade material because of the increased heat and ultraviolet light that it emits. If a table lamp is UL-rated for 75W, it is referring to a standard household bulb. And they need to know, given that some LEDs flicker even more than the worst fluorescent lighting.Q: Since halogens give off more heat, do they present a fire hazard for lamp shades? Will the halogens make the shades deteriorate faster?Ī: Halogens are twice as hot as standard incandescent lamps. Some circuits are better designed than others, but currently the public has no way of knowing whether the LED lamp they are considering purchasing will flicker or not. LEDs that don’t flicker are not much more expensive - they have a similar retail price to those that do flicker. Banning halogen lamps may make lighting more energy efficient but perhaps at the expense of our health, at least until LEDs stop flickering. Ban ballasts, not bulbsĪ ban on magnetic ballasts for fluorescent lighting would have been a good idea for health and energy efficiency. ![]() If magnetic ballasts had been banned in the early 1990s so as to increase the sales of electronic ballasts, we could have avoided the current situation in which unhealthy fluorescent lighting with magnetic ballast is still being used in 80% of UK classrooms, giving children headaches and costing more to run. More efficient electronic ballasts were then becoming available and are now commonplace – and they are healthier because they do not cause flicker in the same way as magnetic ballasts. We discovered in 1989 that the magnetic ballast used to control fluorescent lighting gave the lamps a 100-per-second flicker that you could not see but that caused headaches and eyestrain. The scientific reason you don’t like LED bulbs - and the simple way to fix them ![]() The pattern is most visible when the lamp flickers about 600-1,000 times per second, and it can be irritating. Emily Brown, a fellow researcher at the University of Essex, and I have shown that the pattern can sometimes be seen when the lamp flickers at frequencies as high as 10,000 times per second.Ībove this frequency the pattern is too fine to be seen even when the retinal image of the lamp is very small. The trail of images occurs because the eyes move extremely rapidly when you change gaze from one point to another, up to about 700 degrees per second. Yet flicker has proved a problem, as it did before in the case of fluorescent lighting.Įye movement over LEDs can produce this blur of colour, which appears as a trail of lights. LEDs are more energy-efficient and can help towards commitments to lower carbon emissions from electricity generation. People may not realise when they buy LEDs just how much the flicker varies from one lamp to another. Some LEDs flicker badly, some flicker a little, and some do not flicker at all. Some electronic circuitry is insufficient to reduce the variation in the supply voltage and this process can generate flicker. LEDs are low-voltage devices and the light they give depends on the circuitry hidden in the lamp itself, which changes the alternating current to provide the low voltage the LED needs. Some generate light by a white hot filament (incandescent lamps, such as halogen), some by an electrical discharge through a gas (such as fluorescent lamps) and some by the passage of electrons through a semiconductor (LEDs). There are, after all, lots of different lamps on the market. The European Union recently announced a ban on halogen light bulbs, to persuade the public to switch to LED lamps.
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