Was wondering if anybody using a Fenix successfully changed it by adding a color filter or otherwise to make it a red, green or other color light.

I was contemplating this because I thought it might be useful to have the option of making my 2nd FENIX a powerful red rear strobe for daytime use, as well as making one green to be more attention-getting when I use it for running at night. I'm still continually shocked by the inattentiveness of LA drivers - even with a turbo-mode light shining right into the driver's seat, they pull right out as if I weren't even there (I suspect they think the white light is a more distant car - hence green or even blue as a possibility.)

I'm not sure why you'd want to do this. It's my understanding filtering a white LED (which is already filtered to make white light) significantly reduces the efficiency of the LED. I'd bet a PB Superflash would be brighter than a Fenix with a red filter on it. I spend the money and buy a DiNotte 140L.

Note: I have a DiNotte 140L, PB Superflash, and a Fenix L2D Premium Q5.

They sell a red filter on the Fenix website. I bought one, tried it out in the garage, then I dropped the flashlight and the filter shattered (rest of the flashlight was fine, just like when I've dropped it in the past). While I was using the filter I noticed the red light is dim (much dimmer than my Dinotte 140L...brighter than the Superflash though). The main thing I didn't like for using it as a taillight was the relatively narrow beam compared to the 140L. It's definitely worth the extra $40 to get the Dinotte, and use the Fenixes for front white lights.

That being said, if you already have a Fenix light and want to try out the red filter for yourself, it's cheap enough to just try it out. Just don't mount it facing forward (red lights facing forward are for emergency vehicles only). Also, blue lights are specifically prohibited for use on bicycles in California.

Flashing lights are also prohibited on bicycles in California, so having a weird color (green) flashing may draw some unwanted attention. Personally I run forward facing white flashing lights during the day (including 2 Fenixes) and rear facing red flashing lights (including 2 Dinotte 140Ls), and haven't had any problems (even though flashing lights are technically illegal).

I am confused. Is this filter new or did I get incorrect information from fenix? I inquired a few weeks ago and they said that there were no filters available for the fenix.

Come to think of it, for the LED Fenix's couldn't they make colored LEDs for those? Do they exist? That way there is no loss of efficiency and in fact the lights may be more efficient.

Here is a red cover that Fenix sells direct
https://www.fenix-store.com/product_info.php?cPath=27_38&products_id=338