supply and installation of high intensity 3tier , led marine automatic rotating light beacon for betul lighthouse under directorate of lighthouses and lightships , goa , supply of high efficiency 3 tier led marine rotating beacon with range not less than 22 nm @ 0 . 74t with following specifications: optical specification : light source : high intensity led , colour : white vertical divergence >1 . 5 degree vertical . flash character: programmable , adjustableenvironmental specification , temperature 0 degree c to +50 degree c; intrusion protection >ip65 . ultra violet radiation: all external materials are uv resistant . motor: lens motor drive : brushless direct-drive motor . speed programmable , adjustable from 1 rpm to 16 rpm . electrical specifications: voltage : 12 to 36 vdc low voltage cut out :programmable threshold input /outputs : rs 232 input/output , alarm output , etc . day/night transition: photo sensor located on side of the beacon . program settings for day/night transition . accuracy of sensor +/-20 lux or better . power consumption: 24 ( preferably ) along with any special power supply if required ( ac to dc power supply 230v ac to 12v dc ) . make: vega , msm , tidland , sealite , aeromarineessential spares: pcbs , external light sensor , tacho transducer assembly , software for proramming , led & motor controller , etc