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For the rest of this comment I am going to assume an LED is a single P-N junction. Regarding reverse voltage: Most if not all LED manufacturers will list an absolute maximum reverse voltage as 5V. Yet, many people are driving LEDs directly from an AC power line (120V or 240V) with a resistor for current limiting.
The filaments use a rather high voltage, allowing them to work efficiently with mains voltages. Often a simple rectifier and capacitive current limiting are employed to create a low-cost replacement for a traditional light bulb without the complexity of the low voltage, high current converter that single die LEDs need. [60]
The dental LED curing lights use LED’s that produce a narrow spectrum of blue light in the 400–500 nm range (with a peak wavelength of about 460 nm), which is the useful energy range for activating the CPQ molecule most commonly used to initiate the photo-polymerization of dental monomers."
Paris Hilton is mourning the loss of her family home amid the series of wildfires ravaging Los Angeles. "My heart aches," she wrote on social media.
Bradley Beal came off the bench for the first time in nine years and scored 25 points as the Phoenix Suns ended a four-game skid with a 109-99 win over the Philadelphia 76ers on Monday night.
A 40-year-old man has pled guilty to charges of stalking and harassing UConn women's basketball star Paige Bueckers, ESPN reports.. Robert Cole Parmalee, of Grants Pass, Oregon, entered a guilty ...
The majority of the SAGA line was set during 414 AC, however, the final releases of the line were set in 383 AC. [9] After Wizards of the Coast's acquisition of TSR, the 3rd Edition of Dungeons & Dragons was released in 2000 and Wizards announced that the Dragonlance setting would not be supported. However, Wizards allowed a group of fans to ...
Former England captain Casey Stoney has been named head coach of the Canadian women's national soccer team. The 42-year-old Stoney signed a three-year contract with Canada Soccer that runs through ...