Airport marker lighting system of inset type and method of manufacturing the same

An airport marker lighting system for use in an airport having an approach way, runway and a taxiway, said system comprising:

• a plurality of approach lights, runway lights, touchdown lights and taxiway lights, each of which further comprises a plurality of housings each having a housing body which is buried in the ground with one open end located substantially flush with the ground surface and which each further comprises holding means and a dome-shaped cover which covers the open end of the housing body and which each includes a light projecting section for containing an optical system;
• and
• a plurality of lamps held in the holding means, respectively, of each of housings and which each further comprise a filament, a tubular member containing said filament with a first end thereof being closed, a single ended base fixed to a second end of the tubular member and a flange member attached to the single-ended base for positioning each lamp in cooperation with the holding means of each housing body, wherein said housings further comprise a first, second and a third housing each having cross sections of different sizes and each having a socket of the same type;
• wherein said lamps further comprise a first and second group of lamps wherein the first group further comprises a plurality of lamps of different types of power consumption values ranging from 250 W to 400 W and the second group further comprises a plurality of lamps of different types of power consumption ranging from 30 W to less than 250 W such that in the lamps of said first group the distance between the flange and the upper end of the filament is substantially the same, in the lamps of said second group the distance between the flange and the upper end of the filament is substantially the same and shorter than said distance in the lamps of said first group and wherein said approach lamps each comprise a housing of largest size and at least one lamp from said first group;
• said runway lights each comprise a housing of the largest or next to largest size and at least one lamp selected from said second group;
• said touchdown lights each comprise a housing of the second largest size and at least one lamp from said second group;
• and
• said taxiway lights each comprise a housing of the second or third largest size and at least one lamp from said second group.