Electronics, Lighting, & Gadgets - anyone use Fenix for a tail-light?

I just realized that Fenix sells an optional red filter that you can use rather than the standard clear lens cap. They've got it hidden in a strange place on their web site, under Holsters/Boxes.

https://www.fenix-store.com/product_info.php?cPath=27_38&products_id=338&osCsid=3d5568cc764a3725f06d207b00e0a254

Anyway, it seems like you could easily use a Fenix for tail-light using one of these filters. Should be simple to mount the light to a seatpost or helmet using the TwoFish lockblocks or new bike mount. The only potential issue is that Fenix lights -- my model anyway, the L2D Premium -- don't seem to have very good options for a blinking mode. It will blink rapidly in turbo model, but that cuts the run time. In regular mode, the SOS flash is too slow and irregular. However, if you kept the light on a steady mode, it seems like it would be comparable to a DiNotte tail-light for about 1/2 the price.

Seems like it would work, but there are cheaper options for taillights. I guess you could get a lower and cheaper model Fenix to use. Good idea.

I was more interested in this:
https://www.fenix-store.com/product_info.php?products_id=388&osCsid=3d5568cc764a3725f06d207b00e0a254

Anyone have any experience with it?

If you want a red LED-based taillight it will be much more efficient to use a red LED, not white/blue with a red filter. LEDs put out a very narrow spectrum, much better to start of with the correct color.

tdister is right. The Fenix P3D with red filter appears dimmer than the Dinotte taillight (I have tried both).

Some other negatives of using a Fenix light with a red filter vs. a Dinotte (other than lack of strobe mode already mentioned):

Relatively narrow beam. Viewed straight on it is very bright, but at a slight angle it appears dim. The Fenix must be aimed perfectly in order to achieve the desired effect. The Dinotte provides a much wider, brighter beam which provides more margin for error in mounting and better overall visibility.

The filter is fragile. While I was experimenting with mounting options for my P3D with a red filter attached, it fell off the top of my rear rack onto my concrete garage floor. The filter lens shattered. I have dropped my Fenix lights onto concrete from similar heights (and higher) and the clear lens does not seem to have this problem.

Of course the Fenix with the red filter would still be brighter than most of the taillights out there, and if you've got an extra one laying around and can figure out how to mount it properly the filter could be a good cheap investment. If you ever drop your lights, I'd recommend buying at least a couple of the filters since a routine drop could result in a destroyed filter.

fenix is a spotbeam light with no side visibility therefore not qualified as a rear safety light

everyone makes some good points. But Since I have 2 P3D's...I wanted to try it out and ordered one of them red filters.
I'm planning to use one of the two fish blocks thingamajigs and hook it up to the lower part of the seat post. I will also have two PB flashers flashing on the top part of the seat post and a another pb on the chain stay :P

Thanks for the feedback, all good points. One reason I was considering the Fenix as a tail-light is that it would be easier to mount on my bike than a DiNotte. I can't figure out how to mount a DiNotte on my bike since I use a large Carradice Barley seatbag that makes my seatpost unusable for that purpose. Looks like I'll stick with my PB Superflash for the time being.

Do you have a bagman support underneath the bag?
If so you could mount a dowel with some kind of finish so it doesn't rot or a piece of PVC to mount the dinotte on. You could probably stitch the same somehow onto the bag if taking the dinotte with you was desirable.

Do you have a bagman support underneath the bag?
If so you could mount a dowel with some kind of finish so it doesn't rot or a piece of PVC to mount the dinotte on. You could probably stitch the same somehow onto the bag if taking the dinotte with you was desirable.

I do have the Bagman support rack, but it's difficult attaching things to it. I've tried attaching a rear tail-light with a P-Clip, but it rotates and moves whenever you hit a bump, so after a while the light is facing toward the ground. However, that would be the best place to mount a light if I could figure out a secure attachment.

I just got the red filter. Works nice. the only thing is, if you are using one of those two block fish bike attachments it will angle down a little, as the seat post is at an angle. But i'm ok with that...
nice!