CREE LED bike lamp, 800 Lumens. Only US$ 5.99.
Probably the cheapest or atleast cheaper than these sources I could find:
https://www.banggood.com/XANES-T6-LED-IPX65-Waterproof-Bike-…
https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p238005…
Further 2.8% cashback through CashRewards
Do you mean the powerbank mate? Obviously it doesn't come with that.
But it presumably has an internal battery?
Obviously the Powerbank isn't included but that's what I mean… I don't think it comes with an internal battery either! The Cree Lens & Heatsink assembly looks to be about all that would fit inside the light itself. Would still be a handy bright light for anyone already carrying a PowerBank around for other things tho.
checked with supplier, battery not include.
Let's be real here, is this REALLY 600 lumens?
It's Chumens, Chinese lumens.
Here's the formula:
Multiply price by a thousand, add one million and then double it = Chumens.
should change sites name to LOTB -Light On The Bike
600 Lumens
800
Doesn't matter really because in reality it is neither…
fact?
Generally so. The top BIN, genuine Cree XML LED is truly capable of that figure, but most units in torches do not. Especially not the cheap ones.
This style of light looks appealing, given you just plug it into a powerbank and away you go. Wonder how many hours of operation you'd get from a 20000mAh pack? The pics look decent for light output for a cheap light. Even with a powerbank it's only like $30. Far cheaper than the Lezyne Powerdrive I have which can't be charged while it runs.
I can just see 20000mAh power banks falling off cyclists in the rain+dark, lying on the road getting crushed by vehicles.
Explosion of 5x16550s will make for a good firework show, added to colliding vehicles for the ultimate in night-time entertainment.
But then again, just a little water in an exposed USB connector supplying any kind of power from e LiIon/LiPo battery… and the cyclist will be dealing with 20 thousand degrees of pain in their pocket.
Assuming USB2 then the max current it should draw is 1000mA.
Assuming power bank is good for 70% of its rated capacity, this gives a 14 hour run time.
(Power banks will lose some capacity with use, and it will probably cut out before it runs completely flat to preserve the batteries).
Mine starts my car… (!), but ok, not through the USB connector.
I don't think you'll find all (if indeed many) powerbanks employ enough outgoing current limitations to prevent damage from heavy draw, other than melt-down and reverse polarity control.
2A would be about the minimum, and at 5V that is enough to melt those little wires and cause batteries to get pretty hot after 5mins or so.
But yes, like most LiIon devices they stop supplying power at 70% of rated cell voltage, though they make it look to the user like charge is down to zero.
Looking the idea of this+OTG USB via a phone, if possible
Cyclists would pay hundreds to save the 100g weight of a battery pack
There are similar lamps that run on smaller internal 2x CR2032 cells, presently less than $4 delivered.
Not sure if the cells are included, or if you need a charger. I think LIR2032 are the ones to use (instead of CR2032), as you would want to charge them every time you go out at night. Thye won't drive an 800LM CREE for long
Ok, but the point really is that a phone would likely drive a light for long enough period of time to make it viable for a night time ride (ride home)
If a light can't do a night ride for long enough, it's probably not an option for anyone except maybe race day (daytime safety light blinking mode only) for the elite
max discharge rate for LIR2032 is (12mA)[http://www.batteryspace.com/li-ion-rechargeable-2032-button-cells-lr2032-3-6v-40mah-20d-x-3-2mm-0-14wh-0-012---un-38-3-passed.aspx]. At the nominal 3.6V, thats 43mW per cell, or 86mW total.
Typical efficiency of these Cree's is about 100 lumen per watt, so you'd get about 4 lumens out of such a light at best. Not even enough for a 'be seen' taillight, let alone a bright headlight
Not at all comparable.
Nice, math :-), great contribution!
But it would last a while, and work reasonably well, and be a very light solution. Carting quad packs of 18650s on the bike is madness.
Not to take away form your point about output. But some of these things can do 20000 Lumens, and un-shaded and erraticly wobbling about at night, this much is lethal to those in front. When I'm on my bike, I'm not keen to start a war with other road users ;-)
More and more I'm having trouble with bikes at night. Either they have no lights and wear black, or they have unreasonably powerful lights. it's like there is nothing in-between. Last time I got badly blinded by a pedller with high beams, I high beamed him back with mine. (it used to just be a few motorbikes, but now cyclists are powering up like they need to see snipers (as well as kangaroos) in the bushes.
Can never trust the claimed Chumens, esp. on online markets. All too often you find one model, and then the same, with 3 or 4 levels of Chumens for each product using the same diode. At least the math doesn't lie!
I agree with your observation about "no lights or 20,000 lumens", but I don't think its a majority, it's just those extremes are annoying and stand out. My favourite is Deliveroo riders with no lights. wtf ? At least deliveroo seem to be putting some reflective strips on their bags now, but surely they should require all riders to conform with the basic laws, which includes using suitable lights in dim conditions.
I personally find I need about 320-400 chumens to ride comfortably in the dark.
@effgee: If they had lights, they might get seen.
Maybe Deliverooeys get rolled in dark alleys by hungry zombies at night, or just think they will…
or are a little short on brain cells
"looking" was meant to be "liking"
edit: the description on the bang-good link above looks good. us$12
Are you sure this is not just a crappy plastic copy? Description says plastic only.
Any time there is a good product in china, even an unbranded one, there will soon be bad look-alikes.
Note: this is just the light itself, no battery included! Refer to description & comments: https://www.lightinthebox.com/qa/bike-lights-cycling-impact-…