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STANDARD TALL TRUNK-CONICAL POST-TOP LUMINAIRES Down light design Assembly lateral view |
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CutOff ilustration |
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The only way to predict this Cutoff level is through a true evaluation in a speciality laboratory, under tightly controlled conditions for certifying the luminaire's Cutoff level .
This is true for the completely assembled luminaire with lampshade and cut-off shields included during the evaluation . Optimal luminaire mounting height - 3.35 to 3.65 meters or 11 to 12 feet up to pole's tenon . Solutions for luminaries interior designCutoff and other optics ( interior surface of lampshade ) may be designed according to lamp wattage and lampholder position within the lampshade, for being optimal at this mounting height . The most required Cutoff level is "Full-Cutoff", or "Full-shielded". The large interior space allows a lot of cut-off shields combinations. So, for a "good-neighbour" usage, cutoff shields may be unsymmetrically designed not to allow the light emission to a nearby neighbourhood where the light is not allowed. If a lower vertical (base down) burning position of lamp is chosen, both control gear and lampholder may be fixed on the fixing frame. If a higher lamp burning position, or lamps having "base-up" burning position are chosen, it is required the lampholder-fixing-flange fixed on one of the rods. A highly efficient low pressure ( "horizontal" burning position ) sodium lamp may be used both for common or asymmetrical cut-off shields. A compact fluorescent lamp is also suitable for this kind of luminaire. All kinds of HID ( mercury, sodium, metal-halide ) lamps ( having "base-up" and "base-down" burning positions ) are very suitable. Fixing flanges are designed to join E27, E40, Medium or Mogul lampholder, or those for SOX or compact fluorescent lamps ( BY22D , 2G11 ). Other new kinds of lamp ( cold-kathode, induction lamps…) may be used too. The large interior space of lampshade allows the use of the lamps (bulbs) with asymmetrical light spreading, especially for "good-neighbour" lighting. Examples of interior design- cut-off shields, kinds of lamps, lampholder positioning, control gear ( ballasts, igniters, dimmers,… ) and electrical connection reserved space. |
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