![]() However, this can be fixed by using constant current drivers, which remove the peaks of the sine wave. The essential purpose of the LED driver design is to rely on a simple circuit to control output current, but without altering the frequency, the LED becomes likely to show visible flicker. LED flickering can be tied back to the driver component within the lamp. This leaves it susceptible to being in a range that will cause flickering, or sometimes an audible hum. With AC power, the sine wave will peak both positively and negatively. Unintentional flickering in lighting equipment can be traced back to our power companies that designed electricity flow to use alternating current (AC) as opposed to direct current (DC). These specified frequencies are generally just a few flashes per second, but they are very close to frequencies that cause epileptic seizures. This is a deliberate flicker effect that delivers light at certain frequencies, causing the brain to interpret moving objects as if they were in slow motion. To better understand flickering in lights, consider the theatrical effect known as strobe lighting. The symptoms include dizziness, eyestrain, headaches, migraines, impaired thought, and other general sick-feeling symptoms. It is the flicker that is present but we cannot see. Invisible flicker is just as much of a problem if not more. With 1 in 4000 people suffering photosensitive epilepsy and many more who have not been diagnosed, this has become a public safety issue. Short-term exposure to frequencies in the 3Hz to 70Hz range are associated with epileptic seizures, with the highest possibility of occurrence being in the 15Hz to 20Hz range. There are health concerns with visible flickering. It is considered that anything below a frequency of 100Hz can be seen. Obviously visible flicker is the one our eyes can see, which is when the light output from a given source changes rapidly. There are two types of flickering with lights – visible flicker and invisible flicker. What are the causes of this, and are there solutions? Types of Flickering Despite flickering being less present in LED than with fluorescent systems, it is certainly still a factor. Product Offering Lumen Color Output Wattage Temperature CRI 700 10 3000K 82 900 13 3000K 82 * Performance may vary depending on dimmer use in application.With fluorescent lighting gradually being displaced in favor of LED, many thought the days of dealing with flickering lights were over. Optical Design Optical design efficiently directs light output in an 120° beam angle with low glare. LEDs have virtually no UV or infrared radiation to damage or fade furnishings, art or other objects. Quality of Light The SYLVANIA ULTRA Light Disk provides excellent color rendering (82 CRI), and a color temperature of 3000K. For dimming with digital (smart) multi-location dimmers or when dimming fewer than four LED modules, electronic low-voltage (ELV) dimmers are required (some ELV dimmers need a neutral connection in the wallbox). In some cases, standard incandescent dimmers require a minimum load of typically >40 watts on the circuit for full range dimming performance (four LED modules). Dimming The SYLVANIA ULTRA Light Disk is dimmable to 20% with standard 120V electronic low voltage dimmers (recommended), incandescent or magnetic low voltage dimmers. It can also be surface mounted to standard 4-inch J-Box or using specially designed Connector Box. Installation is done quickly and easily in most standard four-inch, five-inch and six-inch Insulated Ceiling (IC) housings, Airtight (AT) housings and non-IC housings. Multiple installation options for both recessed and surface mount applications. Integrated white trim and medium base for direct replacement The SYLVANIA ULTRA Light Disk is an LED downlight kit creating high performing white light and is optimized for new construction and retrofit applications.Meets California Title 24 fixture requirements for high efficacy luminaire.No warm-up time, instant-on with full light output and stable lamp to lamp color.Lasts up to 17 times longer than incandescent lamps.Suitable for indoor dry and damp locations.Surface mount to standard 4" J-Box or using Connector Box.Fits into most 4", 5" and 6" recessed downlight fixtures. ![]() Replacement for up to 100W incandescent lamps. ![]() ![]()
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