Beam Patterns
Each floodlight fixture designer to satisfy the demands of the client and meet the parameters of different optical solutions. The primary optic is included in the LED package, and the secondary optics are part of the floodlight fixture and are designed to shape the radiation pattern, or beam pattern, maximize efficiency and application spacing. Secondary optics provide unique optical combination possibilities to modify the LED output beam such that the output beam of the floodlights efficiently meets the desired photometric specification. LED secondary optics include reflectors, lenses, total internal reflection (TIR) lenses, and diffusers. Lens has the excellent light-gathering ability to control the distribution of light rays at a small angle. While the reflector has the advantage to redirecting the flux (illuminance) and converging the rays at a large angle. A TIR lens is a combination of lens and reflector, using the principle of total reflection optics to collect and process light. For high voltage applications it is recommended to use PMMA (acrylic) or PC (polycarbonate) lens for their high mechanical strength, excellent optical properties, good thermal stability, high thermal conductivity, and low moisture and water absorbing capacity. In high power floodlighting, lenses and TIR lenses are often used for better uniformity and higher optical efficiency (at least 90% for most applications). It makes sense, however, to use a reflector design in some applications, e.g. sports lighting, to achieve a designed beam pattern and minimize spill light and glare.
Lighting Control
The implementation of controls in high mast led flood light offers many benefits such as energy savings, reduction in light pollution, extending the luminaire life and compliance with energy codes. LED drivers are generally equipped with to dimming circuit for 0/1-10V dimming, DALI digital dimming, or PWM dimming, to allow for adjustment of lighting levels. LED flood lights may also be controlled by motion sensors and are configured to illuminate from low to high power or turn on/on when motion is detected. A photocell can be installed to provide dusk-to-dawn illumination. Emery management system or addressable intelligent controls offers the greatest flexibility and provide multi-way communication channels for networked control. LED RGBW architectural flood lights, for example, can be operated under DMX512 consoles to create fixed or dynamic colorful lighting effects for flood, wash and accent lighting applications to enhance architectural features.
