I have gotten away from trying to mess with 48/52v powered lights. I've got juice-box-sized 52v 6ah packs that are perfect for this job, where they make for gigantic capacity for a headlight, and I still have dropped the concept. In addition to all the wiring you have to use and hide, you handicap yourself mightily by limiting your options to lights like that, which are nowhere near state of the art for bike lighting.
Instead I do cordless rechargeable lights and, once per week, when I get to the office I charge them all up in the morning on a USB hub. All my lights are used daily and all of them have to be daybright as I use them for running/warning lights day and night.
Blinkies increase the conspicuity (I was surprised: thats a real word) of a rider but studies have shown they also degrade a motorist's ability to track your motion. So I use both. A center blinkie and two solids as wide apart as I can put them.
Recently I graduated up to Knog lights, which are the brightest I can find - but they cost. Two Knog square-type Blinders are my solids. A Big Cobber set to eco mode is my blinker. Its a sharp, intense regular blink. Note the Knog Blinder checkerboard version has a mode that is a form of an irregular blink that studies have shown are more noticeable than a regular blink. The excellent Bontrager Flare RT has an irregular blink built into it as well and I have one of those on a different bike. At US$65 it too is pricey but a hospital visit costs more.
On the front of the same bike, I use two Niterider Luminas, set far enough apart and with their mounts 1 click outboard to spread their beams just a tad (without separating them). Thats a good wide beam for the street. In between them is a white flashing Big Cobber set to eyesaver mode (shuts off the top 1/3 of the beam so it doesn't blink in your face). The Big Cobber is the only brand of blinkie that is powerful enough not to get drowned out by two steady lights set just beside it.
On a different bike that sees more use in rural areas, I do the same thing in back, but in the front I use
my sort of new favorite economy beam. Branded by Victagen but sold under multiple names. Like the Niteriders it is also detachable for use as a hand light and has so much capacity it can be used as a power bank for your cell phone (a USB plug is included on it). Niteriders are fantastic but expensive. It is flanked by two
$15 Blitzu Gator 390's that are also set one click outboard. They're cheap, bright with good beam patterns and the battery is decently long lasting when set to its low value (which is plenty when used as a supplement like this). As such, I have one good bright beam forming the point of a spear, and two more beams widening out my field of vision - this kind of flexibility is why I no longer bother to try and solve a lighting need with just one unit. This is a $50 total solution.
also, look down in the lower right corner. Thats where the blinkie goes, separated from the main beams so it doesn't get drowned out. A Knog Blinder again. Set to eco mode which is a sharp, short flash.
Lastly, on a bike with basket bars, I used two of the double beams, one on each side of the rack. You can see a centered white blinkie. This is a
Night Provision front light that is set to blink. These lights are CHEAP and really bright. The battery lasts a full week of use so I used them regularly on a commuter. I have maybe a dozen sets and I relied on these for years before I recently decided to step up to the Knogs. the rears are sold in twos and I put one on each side of my rack, oriented up-and-down, just like you see the square Knogs in the pic above. Another one oriented side to side is the blinkie in the back, center. In a pinch, these are the best
budget daybright running/tail lights I have ever come across.
Look closely and you can see two widely-spaced unused mounts I fashioned on the top bar of the rack. Also there are two of the Gator mounts in the center just above the blinkie. the outboard mounts are just there unused, but the two in the middle I can use if riding in the boondocks to give me a nice spread-out illumination pattern. For $30.
