The length of time a fixture can last is based on how long a fixture is illuminated per day. Based on hours of operation, 100,000 hours is: 24 hours per day = 11.4 years 18 hours per day = 14.8 years 12 hours per day = 22.8 years 8 hours per day = 34.2 years
The LED doesn’t burn out in the conventional sense. To have a way of describing what happens, product life is measured as lumen depreciation. The life span of an LED is much longer than that of incandescent, fluorescent or HID lamps. Fluorescent or HID light sources also show a reduction in light output before they [...]
Probably not. It is not really practical since the assembly process for the individual diode requires precision control of temperature and excellent process cleanliness. A more important question is to consider the arrangement of LEDs within the fixture. Just like the old Christmas tree lights where one bad bulb made and all of the lights [...]
Think of a simple source of light, like a traditional incandescent light bulb, surrounded by a sphere. Light is given off in all directions and illuminates the inside of the sphere almost equally. With an LED, the light is directional, and is given off predominantly in one direction. If the LED points downward, imagine that [...]
The failure rate for most electronic components will double for every 10 °C increase in temperature. This is true for both the LEDs and of the power supply. LED manufacturers have demonstrated that at an LED junction temperature of 135 °C one can expect to get 50,000 hours of operation before the light output will [...]
As an LED’s junction temperature gets hotter, its light output will be diminished. At a 135° C junction temperature, the LED will meet the manufacturer’s specifications. Operating an LED at high temperature results in lower initial light output and a much shorter life. ALLED’s fixtures are designed with thermal properties and electronic components to minimize [...]
Junction temperature is the temperature internal to the LED chip. Junction temperature is a critical measure for evaluating an LED lighting product's ability to deliver long life. The U.S. Department of Energy advises: "Heat management and an awareness of the operating environment are critical considerations to the design and application of LED luminaires for general [...]
The intention of a light fixture is to put light where you want it. This can be accomplished with lenses or reflectors, or both. During ALLED’s initial design and development efforts, ALLED discovered that they could get more light, and better control of the light, at the working surfaces, by using carefully designed reflectors. It [...]
The power supply and LED current regulators must create a precise electrical environment to assure LED longevity. An LED does not typically fail like an incandescent bulb, suddenly leaving no light. An LED fails by slowly diminishing light output over time. Protecting the LED from damaging electrical events and controlling its operating conditions is the [...]
If a typical power supply is used for outdoor lighting, transients on the power line will cause instant failure. Most commercially available power supplies are tested to withstand typical indoor transients of 1000 volts. This is a minimal level needed to get past a short warranty period operation in a well protected building environment. It [...]