More than about 1.2 amps forward through the pcb LED will need some cooling and care

 

http://i.ebayimg.com/images/g/FesAAOSwl9BWM1UO/s-l1600.jpg

http://i.ebayimg.com/images/g/FesAAOSwl9BWM1UO/s-l1600.jpg

 

An oil bath!

 

Perfect for a bike, how stupid I can be.

 

if i leave out the driver i could fill the back of the light with oil and then bolt a heat sink to the top of the light and have passive cooling.

After two good rides Saturday and Sunday I forgot to charge the pack, left it connected and the battery go flat, DOH!

 

Went out tonight and the green LED's on the back were dead!

 

Pretty sure I would have killed it, but left it on charge while I went out for an hour riding.

 

As soon as I came back tried in and illumination returned.

 

So the low voltage protection cut off does work, pity I did not get to see the LED's on the back go red but again for £ 16 thanks d8veh.

 

My Moon Meteor is a good back up, considering it's size it is impressive but the battery capacity is just not there for the high setting to be used much.

they have a basic bms in the pack if you take it apart you will find one of these

 

i think it cuts the voltage at 2.5v tho which is not very good for the cells tbh as set mine to 3.1v cut off because after that they just fall of a cliff voltage wise anyway.

As there are four cells I guess the voltage cuts off at 5 volts and over voltage protection at 8.4 volts ish.

 

I don't think there is any form of battery management just over and under voltage protection, which I am grateful for.

 

The charger does the CC bit and then stops from what I can see, this gives about 80% charge but hopefully long life.

the packs are 2s for voltage 2p for capacity but the bms they use only has 1 sense connector for 1 cell the nickle strip in the photo why it cuts out at 2.5v.

 

 

you could replace it with this but the button for it is on the bottom then you can set the cut off to what you want.

http://www.ebay.co.uk/itm/371352502376?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Edited November 16, 20169 yr by soundwave

Are you sure the cells are not pre-welded, 2p 2s and the two wires must be 8.4 -5 volts as there are only two connections and the electricity needs to get to and from the other cells or there is no point having them.

 

Also my charger says 8.4 volts, (V max).

 

My batteries come in a lovely black nylon pack, I have yet to open and it is going to stay that way. Hopefully?

series gives you voltage and parallel gives you capacity a 4s pack like i have is 16.4v so if i wire another 4 in parallel will give me the same voltage but double the capacity.

 

fully charged the pack is 8.4v 2s but with the bms they use can get the cells out of wack over time as all it is sensing is 1 cell out of 4 so when charging only get that cell to 4.2vish the rest could be under or a bit over you just dont know.

got me light holders and few other bits

 

 

that will be the driver to run this led.

http://i.ebayimg.com/images/g/EWUAAOSwB09YCDhH/s-l1600.jpg

11.6v 1050ma might turn up the currant a bit depends how hot it gets in that case.

parts wise its just under 25 quid - the batts.

Edited November 17, 20169 yr by soundwave

i got board so i have swapped over the led in my tiny torch for the one taken out the bike light and now 2 times as bright but the one in the torch was tiny.

try that for extra cooling

YOU:

 

hi

 

im not very happy with this light as the stated light output says 3000lm, and light distance 200m.

 

 

its more like 300lm with 20m distance.

 

the 12v driver for the led is using the most power and barley nothing going to the led just over 2.4v.

 

the led in this is for a tiny flash light and there 3w 3.3-3.6v and there 99p on ebay.

 

so sorry , would you like me refund you GBP4 as a reparation?

 

YOU:

 

hi

yes please my offer.

 

£20 reparation or you send me a real cree xhp70 led with driver.

 

dear buyer

Sorry for any trouble.

I will resend it today.

You maybe receive it within 15-25 working days.

if you don't receive it, pls let me know, i will try my best to help you,

Best regards,

 

YOU:

 

hi

 

are you sending me a cree xhp70 led or another light ?

 

thanks.

 

yes, we just sent out to this address:my addr.

 

looks like another light then pmsl.

well 5 weeks later and got the led and it is dead as a door nail ffs.

 

well the seller is sending out a new one as it is dead and even tried to put it back on the other way round and still nothing.

 

you can do this on a gas stove with a frying pan you just have to be careful temp wise.

 

here it is with it removed so you can see the size difference.

I think you blew it up with 12 volts.

 

With the next one start at 1.2 volts and go from there.

 

Really with LED's ignore voltage and use current to see what is going on and gradually build up.

 

100 mA good (0.1 amp) and you can increase this, 10 AMPS bad ( but this will only show for a very short time as it blows up).

 

So start low, do not expect very much and you will not be disappointed when you have to wait another season for a replacement.

i did start at 10v and 300ma and turns it up to 12v and still nothing so the led has a fault.

 

forward voltage is 11.6v and 1050ma for this led.

 

its not even trying to light up like when i blew that 20w led in the vid,done that on purpose tho lol.

 

bit of a pita as will takes weeks for another one to get posted out but what can you do.

 

i did screw up on the size tho as the fkn front cover wont go on with that inside it so will have to get a 16mm one:rolleyes:

 

and dont worry i will not give up

Edited December 7, 20169 yr by soundwave

A more solid mount -

Made from the base off this-

http://www.ebay.co.uk/itm/Univers-Bicycle-LED-Torch-Lamp-Flashlight-Mount-Bracket-Holder-360-Rotation-F7Q/322252377125?_trksid=p3693.c100102.m2452&_trkparms=ao%3D1%26asc%3D20140212121249%26meid%3Deb9202652adf472fa2b99aa239040f33%26pid%3D100102%26

 

The base just unscrews, then screw it onto the light using an M4x10 or 12mm screw you find around your garage floor.

A more solid mount.

 

I like homemade mods. Nice one.

 

https://www.youtube.com/watch?v=Ku_uCb9outo

right so got 2 xml 10w t6 on order and 3 xhp70 35w and some heat sink glue as well. £25

 

and 2 cheap 3w leds as well as the other 2 lights im still waiting for. and a xhp 50 as well.

 

they cant all not bloody work

Edited December 8, 20169 yr by soundwave