Technical Note 1: Selecting the correct LED Series Light Source for a glass prismatic lens
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1 Selecting the correct LED Series Light for a glass prismatic lens SL-LED-324
2 Lens description In general, classic lenses fall into two types; revolving and stationary. Both types typically consist of a central refracting (dioptric) section with reflecting (catoptric) sections around the central section. The combination of refracting and reflecting elements makes a catadioptric lens. In a revolving lens the dioptric section is circular with refracting prisms placed in concentric rings. Outside the central dioptric section there are circular or part circular concentric reflecting prisms. Dioptric and catoptric sections combine to concentrate the light into a narrow (pencil) beam. Several lenses may be placed next to one another around a central light source that is permanently lit, which will produce several pencil beams pointing in different directions. The beams sweeping past the eye as the lenses rotate provide a flashing character that is determined by the speed of rotation and the positioning of the lenses. The duration of each flash is determined by the size of the light source, the focal length of the lens and the speed of rotation. A slower rotation will produce a longer flash which will have a greater range than a shorter flash. Since the beams sweep the horizon, mariners will see the flashes at different times depending on their bearing from the light. In a stationary lens, the dioptric refractors form a central belt, with catoptric reflecting prisms above and below. This arrangement concentrates the light into a horizontal fan beam spread up to 360 degrees around the horizon. The light source is switched on and off to provide a flashing character, the flash duration being determined by the mechanism controlling the intermittent power to the light source. One advantage of this control is that the flashing of several lights can be synchronised, since mariners in different positions all see the flash at the same time. The greater the focal length of the lens, the larger the lens area will be, providing greater magnification and greater range. This is true of both revolving and stationary lenses. However, a pencil beam produced by a revolving lens is vastly brighter than a fan beam produced by a similar sized stationary lens. 1st Order Focal Length 920mm 2nd Order Focal Length 700mm 3rd Order Focal Length 500mm UPPER REFLECTING PANEL 3rd Order (small) Focal Length 375mm 4th Order Focal Length 250mm 5th Order Focal Length 182mm 6th Order Focal Length 150mm FOCAL LENGTH CENTRE OF LENS LOWER REFLECTING PANEL REFRACTING PANEL With the introduction of the SL-LED series of light sources, it is possibly to switch off the parts of the light source that are to landward or in sectors where the light is not required, thereby saving power. The tables provide a guide to the ranges that may be possible for a given light source. It is however recommended that each station is surveyed so that details of astragal width, glazing and general condition of the lens can be taken into account. Sealite is able to provide this service. Please fill in the check list provided with lens measurements and pictures. Cape Byron Split Point Cape Byron 1st order bi-valve or clam lens SL-LED-324 Cape Byron 2
3 Typical Performance of Sealite LED Light s within Classic Rotating Optics 1st Order f = 920mm Lens area sq cm SL-LED ,665, SL-LED ,197, nd Order f = 700mm Lens area sq cm SL-LED ,744, SL-LED ,438, rd Order f = 500mm Lens area 8460 sq cm SL-LED , SL-LED ,937, SL-LED , Sm 3rd Order f = 375mm Lens area 4110 sq cm SL-LED , SL-LED , SL-LED , st Order 3 panel 1st Order 3 panel 1st Order 8 panel upper reflector 1st Order 8 panel without reflectors 1st Order bi-value or cam lens 2nd Order GP3 2 panel 3
4 4th Order f = 250mm Lens area 1840 sq cm SL-LED , SL-LED , SL-LED , th Order f = 187.5mm Lens area 940 sq cm SL-LED , SL-LED , th Order f = 150mm Lens area 497 sq cm SL-LED , SL-LED , st Order with drum for long eclipse 3rd Order GP2 4 panel red filter on glazing 3rd Order GP2 2 panel & author 3rd Order GP3 2 panel with additional reflector panels per beam 3rd Order GP3 2 panel 3rd Order mould glass panel 4th Order small 2 panel 4th Order 12 panel Notes: 1. Light power must be limited to 80W maximum when run continuously. 2. Light power must be limited to 108W maximum when run continuously. 3. Light power must be limited to 162W maximum when run continuously. 4. All intensity and range figures include glazing and astragal losses (15%) and service conditions allowance (25%) as per IALA Recommendation E-200: The term refers to the flash duration in seconds at 50% of peak intensity. 6. The term Night refers to the nighttime nominal range in nautical miles with an atmospheric transmissivity (t) of The performance figures stated are meant only as a general guide. Performances of optics vary widely, as do their dimensions. For a more accurate estimate of individual optic performance, refer to IALA Recommendation E Specific lens dimensions will be required and can be used in conjunction with light source dimensions and luminance figures given in the Sealite LED Light table 4
5 Typical Performance of Sealite LED Light s within Classic Fixed Optics 1st Order f = 920mm Lens height 250cm SL-LED , SL-LED , nd Order f = 700mm Lens height 202cm SL-LED , SL-LED , rd Order f = 500mm Lens height 165cm SL-LED , SL-LED , SL-LED , Sm 3rd Order f = 375mm Lens height 115cm SL-LED , SL-LED , SL-LED , th Order f = 250mm Lens height 77cm SL-LED , SL-LED , SL-LED , th Order f = 150mm Lens height 40cm SL-LED , SL-LED , st Order drum lens with sector on glazing & SL-LED-324 1st Order rear reflector 2nd Order 360o drum lens 3rd Order small lens in lantern housing 4th Order 270o drum lens 4th Order 360o with SL-LED-40 5th Order f = 187.5mm Lens height 55cm Notes: SL-LED , SL-LED , Only for flash character duty cycle of 1:2 or less. 2. Figures quoted are for flash durations of between 0.2 and 2.0 seconds. They include glazing and astragal losses (15%) and service conditions allowance (25%) as per IALA recommendations E-200: The term refers to the flash duration in seconds at 50% of peak intensity. 4. The term refers to the nighttime nominal range in nautical miles with an atmospheric transmissivity (t) of The performance figures stated are meant only as a general guide. Performances of optics vary widely, as do their dimensions. For a more accurate estimate of individual optic performance, refer to IALA Recommendation E200:2008. Specific lens dimensions will be required and can be used in conjunction with light source dimensions and luminance figures given in the Sealite brochure. 5
6 Sealite Pty Ltd 11 Industrial Drive, Somerville Vic 3912 AUSTRALIA t: +61(0) f: +61(0) Sealite USA, LLC 61 Business Park Drive Tilton New Hampshire USA t: +1 (603) f: +1 (603) Sealite United Kingdom Ltd 11 Pinbush Road Lowestoft Suffolk NR33 7NL UNITED KINGDOM t: +44 (0) f: +44 (0) w: e: 2015 Sealite Pty Ltd
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