Sound adaptive cooling system for a stage light

1. A lighting device, comprising:

a lighting fixture that emits light based on an electrical controlling signal;

an electrically controllable variable fan, coupled to cool said lighting fixture;

a controller, which controls a speed of said fan between multiple different speeds, based on an amount of sound in an area;

said controller setting said fan to a level of fan speed that is higher when the amount of sound is higher, and is lower when the amount of sound is lower,

wherein said electrical control signal includes first information to control said lighting fixture and second information that indicates an expected amount of ambient sound at least at one time,

and said controller controls said fan speed based on said expected amount of ambient sound, between at least a first amount of output of said fan which occurs when the amount of sound is expected to be lower, and a second amount of output of said fan, which produces more output from said fan and more noise from said fan, which occurs when the amount of sound in the area is expected to be higher.

2. The lighting device as in claim 1 , wherein the controller sets the fan level to off when a current amount of sound is lower than a specified amount, and sets the fan level to one of multiple different speed modes when the amount of sound becomes higher than the specified amount.

3. The lighting device as in claim 1 , wherein said controller selects a fan speed that produces a sound amount that is not hearable in the area, over the amount of sound in the area.

4. The lighting device as in claim 1 , wherein said controller detects an overtemperature condition in the lighting device in which a temperature within the lighting device is higher than a specified amount, and automatically increases an output of said fan independent of said amount of sound.

5. The lighting device as in claim 1 , further comprising a microphone, that transmits a signal indicative of the amount of sound in the area, to said lighting device.

6. A method of cooling a lighting device, comprising:

detecting an amount of sound in an area;

controlling a lighting fixture to emit light, said controlling comprising providing an electrical controlling signal that controls a light output of the lighting fixture;

controlling an electrically controllable variable fan to cool said lighting fixture, by controlling a speed of said fan between multiple different speeds;

said controlling the speed of the fan comprising setting a level of the fan speed, based on the amount of sound detected by said detecting;

said controlling comprising setting said fan to a level of fan speed that is higher when the amount of sound is higher, and is lower when the amount of sound is lower,

wherein said electrical controlling signal includes first information to control said lighting fixture and second information that indicates an expected amount of ambient sound at least at one time,

wherein said controlling comprises controlling said fan speed based on said expected amount of ambient sound, between at least a first amount of output of said fan which occurs when the amount of sound in the area is expected to be lower, and a second amount of output of said fan, which produces more output from said fan and more noise from said fan, which occurs when the amount of sound in the area is expected to be higher.

7. The method as in claim 6 , wherein the controlling sets the fan level to off when a current amount of sound is lower than a specified amount, and sets the fan level to one of multiple different speed modes when the current amount of sound becomes higher than the specified amount.

8. The method as in claim 6 , wherein said controlling selects a fan speed that produces a sound amount that is not hearable in the area over the amount of sound in the area.

9. The method as in claim 6 , further comprising detecting an overtemperature condition in the lighting device in which a temperature within the lighting device is higher than a specified amount, and automatically increasing an output of said fan independent of said amount of sound detected.

10. The method as in claim 6 , further comprising using a microphone, that transmits a signal indicative of the amount of sound in the area, to said lighting device.