I've been using a Dinotte 140 as my primary taillight for many years. When I got it, it was about the brightest available. Altho there are brighter lights now, my Dinotte 140 is still working and I can't justify the expense for replacing it. My Dinotte is bright enough to be visible in daylight and is crazy bright in the dark. It is like having a red headlight on the back of my bike.

That said, it has a few drawbacks. It has a separate battery pack with 4AA cells, which will hold a charge about 3-4 days (7.5-10 hours). The Velcro strap that holds the battery case has worn out, so I have to carry it in my seat or rack bag, which it barely reaches. I can get a replacement from Dinotte but it's not worth cost. The 140 is designed to mount to a seatpost with no other options provided by Dinotte. I have rigged up an alternative mounting since my seat and rack bags block my seat post. I have constructed mounts using 1" PVC pipe screwed to the rack mounts on the seat stays of my bikes, and I attach the Dinotte tail light to the pipes similar to how they mount to seatposts.

I probably should replace my 140 with a Dinotte 300-400, and they will give me a $30 trade-in discount, but just don't feel like spending that much on another tail light because LED lights have been improving so much. My ideal tail light would have the following features:

- Brighter than standard blinkies such as Superflash, Radbot, etc.
- Decent visibility from the sides.
- Rechargeable with USB fittings.
- Battery life that would last at least 10 hours between charges.
- Attachable to a Tubus rear rack or with Planet Bike mounts.
- Fittings so light could attach to seat stays if needed.
- Cost less than $100, preferably under $50.

So far, I haven't found a light that meets those specs. The Cygolite comes close but doesn't fit Planet Bike mounts, and apparently its side visibility is not so great.