Fenix L2T v2.0 Rebel Hissing

[Modern_Major_General]

Has anyone else noticed their Fenix L2T v2.0 (or any other of their newer Fenix Flashlights, CE or Rebel editions) making a high pitched hissing or buzzing noise when on the highest setting? Not terribly loud, but definitely audible.

I got my L2T v2.0 rebel today, which is the first Fenix I've owned since they abandoned the Luxeon III, and the noise it made on high mode caught me a little off guard. Very bright light though .

 

[bondr006]

I guess it's too high pitched for my 47 year old ears. I can't for the life of me hear it.

 

[REparsed]

Can't hear anything from The P1D CE I have, although if I place it close to an AM radio I can hear RFI when it's on high.

 

[Gunner12]

That sound might be from the transistor or inverter(it's some electrical component) switching on and off rapidly and causing some vibrations.

 

[Daniel_sk]

I just checked my L1D CE - I can hear that sound, but only when I hold it next to my ear. It's pretty normal for new LED lights (I think it's coming from the inverter or something like that?).

 

[Modern_Major_General]

That sound might be from the transistor or inverter(it's some electrical component) switching on and off rapidly and causing some vibrations.

Would you say this is a sign of a defective transistor or inverter, or is it to be expected?

 

[Daniel_sk]

It's expected and you don't have to worry about this at all.
This sound is much louder on my SF A2, I first thought it's coming from the tailcap but it's the circuit that generates this sound (and every A2 makes this).
I am not an electrician but the sound comes from transformers/inverters, it's the same sound when you stay close to a big transformer near power lines.

 

[Modern_Major_General]

Cool thanks for the info :thanks: