Powering CREE XM-L T6 LED front light with light output from KT controller

[pajtaz]

Hello,

I am in process of researching parts for my ebike conversion. I have selected all the parts but would also like to see if it is possible to power my existing front light after conversion. I have CREE XM-L T6 LED based front light which I love. It is this light: https://nl.aliexpress.com/i/940043573.html?spm=a2g0z.12057483.0.0.17cc323brI4eoX

It comes with a 8.4V battery that I now use regularly. However I see no point in having a separate battery for this light when there will be a nice large 48V battery that I will always have on the bike.

I have already selected controller KT36/48SVPR-20A (from pswpower) which has a lamp output. I am assuming this output is 48V. Can anyone help with the following questions:

1. Is there a nice 12V DC to DC converter with output plug that I can use with this light and that I can connect to the lamp output of KT controller? Ideally converter would be waterproof and have the exact waterproof plug I need for the light.
2. Has anyone used the following light which pswpower sells that can be used with KT controller and tell me if it is strong enough and focused enough for proper night commuting: http://www.pswpower.com/ven.php?cargo.2016-38-4x8c

Any help or suggestions are appreciated. Thank you.

 

[vfr400]

I think it would be better to use one of these that has a built in buck converter. Wire it direct to your battery with a simple handlebar switch.

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[Andy-Mat]

Hello,

I am in process of researching parts for my ebike conversion. I have selected all the parts but would also like to see if it is possible to power my existing front light after conversion. I have CREE XM-L T6 LED based front light which I love. It is this light: https://nl.aliexpress.com/i/940043573.html?spm=a2g0z.12057483.0.0.17cc323brI4eoX

It comes with a 8.4V battery that I now use regularly. However I see no point in having a separate battery for this light when there will be a nice large 48V battery that I will always have on the bike.

I have already selected controller KT36/48SVPR-20A (from pswpower) which has a lamp output. I am assuming this output is 48V. Can anyone help with the following questions:

1. Is there a nice 12V DC to DC converter with output plug that I can use with this light and that I can connect to the lamp output of KT controller? Ideally converter would be waterproof and have the exact waterproof plug I need for the light.
2. Has anyone used the following light which pswpower sells that can be used with KT controller and tell me if it is strong enough and focused enough for proper night commuting: http://www.pswpower.com/ven.php?cargo.2016-38-4x8c

Any help or suggestions are appreciated. Thank you.

I personally would not do "extra work", to attach any light to the bike battery, for a "battery" (pun intended!) of reasons:-
1) Of the two e-bikes I have owned, one cut ALL power to everything when the Battery was empty. This happened to me in a forest, on a dark night without a moon, insignificantly better than being on a busy road at night with no lights!
The other one did leave the rear light on, but no front light. Still blind and no warning to opposing traffic at the front! UGH!
2) Any of the power wires on a bike, especially those external to the frame, are always slightly in danger of damage during a fall, thats quite normal, but this could have adverse effects on available power.
Of course you put a fuse in, but do you always have the tools and the fuses and another light source to both get at the fuse and to replace it? (Middle of night, dark forest situation that I had to walk home from!)

The best answer I can think of is to have a USB socket, properly installed, and lights with also a USB socket for charging, but with an internal rechargeable battery. They are SO cheap nowadays...Two if you like a lot of light.
I find it very positive that my present bike actually came with a USB socket for such reasons, but I would never have thought of it myself!
Naturally telephones and Navis can also be charged too!
Have a good think about it and make your own mind up of course.
Regards
Andy

 

[pajtaz]

I think it would be better to use one of these that has a built in buck converter. Wire it direct to your battery with a simple handlebar switch.

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This seems the best option. This is perfect actually. However it doesn't show the connector. Is the same connector as the one I have now? Can I connect it to KT controller lamp output? Or do I have to somehow wire it to the battery?

As for Andy's response, I am trying to minimize the time and effort. So if I have to constantly remove the light from the bicycle to charge it then again put it back on, it's the same if I continue using my existing light. I also have to remove the battery, charge it, then put the battery back on. So there is no benefit in buying a USB charging light. Thanks for the suggestion.

 

[vfr400]

This seems the best option. This is perfect actually. However it doesn't show the connector. Is the same connector as the one I have now? Can I connect it to KT controller lamp output? Or do I have to somehow wire it to the battery?

As for Andy's response, I am trying to minimize the time and effort. So if I have to constantly remove the light from the bicycle to charge it then again put it back on, it's the same if I continue using my existing light. I also have to remove the battery, charge it, then put the battery back on. So there is no benefit in buying a USB charging light. Thanks for the suggestion.

I would always wire it directly to the battery wires, which gives you more control and less chance of problems.

 

[trevor brooker]

do I have to somehow wire it to the battery?

see previous thread for useful information

https://www.pedelecs.co.uk/forum/threads/stvzo-lights-with-lenses.35542/

 

[anotherkiwi]

https://endless-sphere.com/forums/viewtopic.php?t=97279

 

[Andy-Mat]

This seems the best option. This is perfect actually. However it doesn't show the connector. Is the same connector as the one I have now? Can I connect it to KT controller lamp output? Or do I have to somehow wire it to the battery?

As for Andy's response, I am trying to minimize the time and effort. So if I have to constantly remove the light from the bicycle to charge it then again put it back on, it's the same if I continue using my existing light. I also have to remove the battery, charge it, then put the battery back on. So there is no benefit in buying a USB charging light. Thanks for the suggestion.

Adding a USB charging point, saves all that! I was lucky that my present bike came with one! But they are relatively cheap to buy and easy to install IMO.
The important bit is having electricity stored "in the light", as a buffer, so that if your bike battery is ever empty, you still have lights front and back.
For example, I have a rear light on USB charging (with built in alarm and a remote control), but the front light has 4 AAs and I use mostly rechargeable, but you would be amazed at just how long they run for, in summer, months! In winter still weeks.....I have never measured it exactly, but its a very long time!
In an emergency, normal batteries may be used, but I have never had the need....
I also use the USB charging socket to recharge my GPS Tracker s well, and to recharge my phone or run a GPS!
But at the end of the day, you must decide for yourself and live with the decision you make.
I have only been "blacked out" once myself and once was more than enough! Dark night and in the forest!!
But the same happening on a road would probably be even more dangerous!!
Just a thought!
Regards
Andy