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____ lamps have the lowest efficacy of the hid family, which ranges from 30 lumens per watt for the smaller-wattage lamps to 65 lumens per watt for the larger-wattage lamps.

Answer :

Mercury vapor lamps have the lowest efficacy of the hidden family, which ranges from 30 lumens per watt for the smaller-wattage lamps to 65 lumens per watt for the larger-wattage lamps.

What are Mercury vapor lamps?

  • A mercury-vapor lamp is a gas-discharge lamp that produces light by passing an electric arc through vaporized mercury.
  • In most cases, the arc discharge is contained within a small fused quartz arc tube mounted within a larger soda lime or borosilicate glass bulb.
  • The outer bulb can be clear or phosphor-coated; in either case, it provides thermal insulation, protection from the light's ultraviolet radiation, and a convenient mounting location for the fused quartz arc tube.
  • The lowest efficacy of the hidden family is that of mercury vapor lamps, which ranges from 30 lumens per watt for lower-wattage lamps to 65 lumens per watt for higher-wattage lamps.

Therefore, mercury vapor lamps have the lowest efficacy of the hidden family, which ranges from 30 lumens per watt for the smaller-wattage lamps to 65 lumens per watt for the larger-wattage lamps.

Know more about Mercury vapor lamps here:

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