Size of the lens and LED affects the optical performance, so exact FWHM angles etc. TIR lenses are arranged in different categories depending on optical performance. This difference can easily be seen with tight spot optics as reflectors usually don’t have as sharp a cutoff as TIR lenses. With reflectors a big part of the light doesn’t “touch” the reflector and this light can’t be controlled in any way. The basic working principle is the same for both TIR lenses and reflectors, but TIR lenses have more control over light. The lenses can be designed in arrays for multiple LEDs or have mechanical details included to aid mounting. Typically TIR lenses are rotationally symmetrical designs which give a nice round light distribution. These lenses are often called TIR lenses as a big part of their design relies on total internal reflection. Most typical lenses in the LEDiL standard product range are the cone-like lenses.
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