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Lucy Letby
by diggingdeeper - 18th Jul 2026 8:11pm
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Joined: Dec 2008
Posts: 526 Likes: 1
Smartchild
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Smartchild
Joined: Dec 2008
Posts: 526 Likes: 1 |
Hi there,i have a technical question regarding bulbs leds volts amps etc that i don't understand. So here goes, i have a twin set mountain bike bulb setup http://www.blt-lights.com/manuals/blt_explorer.pdfAnd i want to take out the old mr11 bulbs and fit a cree led kit like this http://www.cutter.com.au/proddetail.php?prod=cut947The system is 6 volts, 4.3 amp/hour, sealed lead acid bottle battery Low beam 6v 6w MR-11 Halogen (avg.run time per full charge: 3.25 hrs.) How long would i get now on a 370 lumen, and more to the point would this all work together or do i need something else and how easy would it be to solder together. All the blt system works fine now it just doesn't work for very long and the bulbs are a bit dim compared to the white crees running on my mining caplamp right now. Ta pace
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Joined: Apr 2009
Posts: 2,371 Likes: 2
Forum Master
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Forum Master
Joined: Apr 2009
Posts: 2,371 Likes: 2 |
I have made many torch contraptions over the years for both my bike and hand held but I have no experience of crees. It you could find out the currant draw of the crees you are planning to use you could work out the run time. Have you looked here?. Everything you need to know about all things that glow are here. *****WARNING! MAJOR GEEK WEBSITE URL ALERT!!!***** http://candlepowerforums.com/vb/index.php?Have a look in the bicycles sub forum in the transportation lighting section. Yes I am a member. 
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Joined: Apr 2009
Posts: 2,371 Likes: 2
Forum Master
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Forum Master
Joined: Apr 2009
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1 x Recom RCD-24-70/W. A 700 mA wired driver in very small form factor that is 96% efficient, meaning more light, less heat Does that mean it only draws 700ma? Currently the 6v 6w in your low beam draws 1 amp and the 15w in the high beam draws 2.5 amps. So if thats the case the crees would be a significant improvement. Someone who can remember what they where taught in collage better than I can could work out the actual runtime for you.
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Joined: Dec 2008
Posts: 526 Likes: 1
Smartchild
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Smartchild
Joined: Dec 2008
Posts: 526 Likes: 1 |
wd40 informs me that 1 watt at one amp will be 4.3 hours based on my duffish bottle battery
watts = volts * amps - is all you need to know.
A 6 watt bulb at 6 volts, uses 1 amp (ie 6 watts divided by 6 volts - derived from: "watts=volts*amps", therefore "amps=watts/volts").
Therefore a 4.3 amp/hour battery will provide 1 amp for 4.3 hours (you are actually getting 3.25 hours, therefore battery must be a bit dud).
The lumen is a measure of light, and has nothing to do with the electrical power used, it depends more upon the efficiency of the light source (led or bulb). But - a 1 watt cree will still last for the 4.3 hours, but give out a lot more light.
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Joined: Jul 2008
Posts: 14,571 Likes: 38
Wiki Master
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Wiki Master
Joined: Jul 2008
Posts: 14,571 Likes: 38 |
The amp-hour rate for rechargable batteries is based on 20 degrees C and 10 hour discharge current. Higher currents will have a lower amp-hour, likewise temperature at charge and discharge can affect capacity.
What CREEs are you using? The 6V might be a bit too low voltage to drive them after the current regulator.
There's a real danger that the left will drag Britain back to the 1970s, with secure well-paid jobs, ample housing, properly-funded NHS and social care, free tuition, student grants, final salary pensions, affordable rail fares and fabulous films and music. David Osland 2025 We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn https://ddue.uk
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Joined: Dec 2008
Posts: 526 Likes: 1
Smartchild
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Smartchild
Joined: Dec 2008
Posts: 526 Likes: 1 |
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Lucy Letby
by diggingdeeper - 16th Dec 2024 7:16pm
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