Red filter makes my lights whine louder

[Creecher]

I was recently given a piece of red filtering gel/plastic used in theatres for true red lighting. I have a few lights that whine a little, 2 Litefuxes and a Solarforce L2M with MCE.

When I move the plastic closer to the lens the volume of the whine increases. I didn't even know the Solarforce whined at all until I tried it. I don't think it's caused by the plastic reflecting or amplifying the sound as I've tried moving several different objects towards the lights with no increase.

Anyone?

 

[purduephotog]

I was recently given a piece of red filtering gel/plastic used in theatres for true red lighting. I have a few lights that whine a little, 2 Litefuxes and a Solarforce L2M with MCE.

When I move the plastic closer to the lens the volume of the whine increases. I didn't even know the Solarforce whined at all until I tried it. I don't think it's caused by the plastic reflecting or amplifying the sound as I've tried moving several different objects towards the lights with no increase.

Anyone?

It's probably the coil. That can have a little whine to it- and the plastic is amplifying it like a drum skin.

 

[MrGman]

The LED's are whining at taking their pure blue light, making a partial spectrum of white light through phosphor coating and then filtering out everything except the red. Thereby losing all of the original light source blue and most of the lumens of output in a most inefficient way.

This is a sin and crime against illuminated humanity, the "smart" modules know this and they are crying. Use a red LED if you want red light or use an incandescent which is very high in the red spectrum and put a filter in front of that. Don't ruin a perfectly good white light LED module by putting a red filter in front of that.

The photon police should be knocking at your door. .

Either that or maybe, the cellophane used to make the red filter sheet has some metal in it and is in fact vibrating to the pulse frequency of the coil in the flashlight because its a thin membrane. I remember a security guard showing me that the cellophane wrapper from a pack of cigarettes was tripping his hand wand metal detector set to high sensitivity.

I still would go with the first explanation and not risk offending the LED light with a red filter. G. :devil:

 

[Burgess]

Could also be the mating call of Chip Weevils.




_

 

[Creecher]

The LED's are whining at taking their pure blue light, making a partial spectrum of white light through phosphor coating and then filtering out everything except the red. Thereby losing all of the original light source blue and most of the lumens of output in a most inefficient way.

This is a sin and crime against illuminated humanity, the "smart" modules know this and they are crying. Use a red LED if you want red light or use an incandescent which is very high in the red spectrum and put a filter in front of that. Don't ruin a perfectly good white light LED module by putting a red filter in front of that.

The photon police should be knocking at your door. . :devil:

Very true, the filter knocks out a massive amount of lumens, especially the poor MC-E. It's still a mystery though. I tried moving a piece of plastic sheet and a piece of metal sheet towards the bezel with no increase in whine. It's just the red filter material.

 

[rockz4532]

Could also be the mating call of Chip Weevils.




_

 

[Marduke]

It's called resonance...