From the NannyMUD documentation

LAST CHANGE

2000-12-18

COMMAND

NAME
        light - adjust light level


SYNTAX
	light [[-]value]

DESCRIPTION
	This wiztool command adjusts the light level of the wizard, thus the
	light will move when the wizard does. If no argument is given, the
	light level is adjusted to 1.


EXAMPLE
	light -10   Removes 10 units light from the current light level.


EXAMPLE
	light 5     Adds 5 units of light to the currecnt light level.


EXAMPLE
	light       Sets the light level to 1 unit of light.