A quick review on the Eanes SFL-01 headlight and 2 in 1 taillight. I've used them on a dozen or so night rides. Mounted both on my helmet. Mounted the tail light through vent holes at back with supplied rubber straps. Those weren't long enough for the headlight on top. Used just the bracket for the included head mount, it isn't designed to attach to helmet, and some velcro straps from my parts bin to secure. With this setup the headlight is easily removed for charging without removing entire mount from helmet.

I run the 2in1 taillight in solid red helmet mounted up high combined with an old Planet Bike Super Flash blinking mounted to seat post. This light appears brighter than the super flash with better width of field. I've ran it over 2.5 hours between charges. It lasts longer than headlight and usually just charge both at same time. Like the redundancy and supposedly the solid light gives better depth perception to overtaking cars than the flashing. The flashing is to catch their attention.

The SFL-01 headlight I run on the light sensor mode mounted on top of helmet combined with handle bar mounted Rio mentioned in this thread. Occasionally notice it dimming in lighted sections, but basically seems to run in high all the time. It does automatically start dimming when battery is discharged which gives you some warning of low battery if you lose track. I seem to get about 3 rides or 2.5+ hours on a charge. Really like the redundancy and flexibility this offers. It is dimmer than the bar light, but has a wider pattern and fills in great on the longer throw Rio giving a triangular lit area in front of bike. Helmet mount works great for looking at street signs, looking inside of an upcoming corner, looking at any vehicles you want to make sure notice you. at stops/side roads or off bike looking in seat bag or changing flat adjusting shoes etc. I lost track of the Rio charging cycle a few days ago and it quit abruptly about 75% into ride. Was able to get home comfortably with just the SFL-01 at a slightly reduced pace on totally dark streets. I felt OK with the SFL-01 on known streets about 15mph. With both lights I am good into the mid 20's. Will be interested to see how the battery lasts over the winter.

Highly recommend both of these products

UPDATE 4/1/21 : BANGOOD will NOT stand behind delivery and will Keep your money. I highly recommend giving your hard earned money to a reputable business! Good lights for under $20 are easily available from other Chinese mail order companies that do stand behind their deliveries.