Answer / sri harsha

because they have high wavelength as compare to other ones.... because as we know that light coming from the sun light i.e., VIBGYOR order of its wave length and the medium it can travel.

thus i bold that these have high wave length,so brighter

Answer / nithi

People look more good (too fair)in sodium lamp(yellow
colour light).that's why it is used in the street.

just for fun.

I think,the lumens per watt is higher in sodium lamp.
(i.e. luminous efficiency of sodium vapour lamp may be
high.)

Answer / k.prakashchandra

In misty areas sodium lamps are more suitable

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