Used to race 24 hr mtn bike races so I will respond.
To directly answer your question, I have not ordered that light nor anything similar recently.
That said... it you are looking for a cheap bar light... find an 18650 based cheap flashlight and a twofish lock block bar mount. Rugged, cheap, bright, safe, and easily removable for theft. As a bonus, you also get a flashlight.
The twofish lock block will be great unless you are actually off roading at a race pace. I used to run dual light and motion HID lights ($300+ each) for night riding, and now I run a zebralight 602(?) instead.
1) looking for a cheap bar light to put on my nieces & nephew's bike. They use Samsung cell phone power banks on their tablets when the tablet battery runs low. The cell phone power banks are as plug-n-play as you get.
2) b/c they are little kids, I was looking for a bar light that runs off a 5 volt, cell phone power bank
3) as for MY light source, I am looking to get a pair of Convoy S2+ with the SST40 LED in their, with the stripe lens to spread out the hotspot. On my bike, I currently use my Fenix TK09 2016, typically on medium @ 450 lumens. I want a 2nd light, that way I have to on each side of the bar. I could get myself another one, but I can get 2 S2+ AND some rechargeables for the price of another Fenix (thought I really like me TK09, lol)
4) as I've been reading more about lights on bikes, I have come across a few people addressing "cut off". The riding will be on neighborhood bike trails, nothing off road mountain biking. Do you use an adapter or anything to create a cut off so you don't blind anyone coming your way?
5) I came across this light, that is made specifically for bikes, with a cut-off:
https://www.amazon.com/gp/product/B08FDK43X7/?tag=cpf0b6-20[FONT=Verdana,Arial,Tahoma,Calibri,Geneva,sans-serif] BUT, that's ~$35 a light; $70 if I get 2! [/FONT] I am on a budget buying the light for myself & my nieces & nephew.