WikiWirral Wirral's Biggest Online Forum
Forum Statistics
Forums65
Topics76,352
Posts1,033,281
Members14,560
Most Online16,551
Feb 2nd, 2024
Who's Online Now
9 members (ArranGirl13, 3 invisible), 8,070 guests, and 433 robots.
Key: Admin, Global Mod, Mod
Top Posters
sunnyside 45,164
MattLFC 22,315
Mark 21,269
granny 17,788
_Ste_ 16,345
Newest Members
Kalena1962, rattus, Lisrush, Emotecreative, ArranGirl13
14,560 Registered Users
New General Forums
New Wirral History
Tall Brick Chimneys
by diggingdeeper - 16th Mar 2024 11:56am
D.I.Y. / Building Shop
by mharford91 - 3rd Mar 2024 8:53pm
1970's Murder in Central Park, Wallasey
by cutespam - 4th Aug 2018 10:28am
Old Hall in Higher Bebington
by Rhoobarb - 25th May 2010 5:55pm
Oleo Works
by Ducko - 14th May 2008 3:09pm
Top Posters(30 Days)
granny 14
casper 13
bri445 4
Topic Replies
What song are you listening to?
by diggingdeeper - 28th Mar 2024 6:06pm
Facial recognition coming in supermarkets?
by diggingdeeper - 27th Mar 2024 3:50pm
Bolts at Bebington Road
by diggingdeeper - 27th Mar 2024 2:33am
Hot Spot Chippie Broadway
by Excoriator - 26th Mar 2024 7:57pm
Tall Brick Chimneys
by diggingdeeper - 26th Mar 2024 5:43pm
Lost river (Well, brook really)
by diggingdeeper - 26th Mar 2024 3:09am
Old Hall in Higher Bebington
by diggingdeeper - 24th Mar 2024 5:58pm
Netflix 3 Body Problem.
by BultacoAstro - 22nd Mar 2024 8:04am
Wisper electric bike. 36v .
by Dilly - 21st Mar 2024 7:36pm
March
M T W T F S S
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31
Top Likes Received (30 Days)
Kylix 1
cools 1
Top Likes Received
bert1 14
Mark 4
granny 3
casper 3
Previous Thread
Next Thread
Print Thread
#375864 23rd Dec 2009 12:19pm
Joined: Dec 2008
Posts: 523
Likes: 1
pacef8 Offline OP
Smartchild
OP Offline
Smartchild
Joined: Dec 2008
Posts: 523
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.pdf

And 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=cut947

The 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


Google Ads
Joined: Apr 2009
Posts: 2,354
Likes: 1
Forum Master
Offline
Forum Master
Joined: Apr 2009
Posts: 2,354
Likes: 1
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. sorry

Joined: Apr 2009
Posts: 2,354
Likes: 1
Forum Master
Offline
Forum Master
Joined: Apr 2009
Posts: 2,354
Likes: 1
Quote
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.

Joined: Dec 2008
Posts: 523
Likes: 1
pacef8 Offline OP
Smartchild
OP Offline
Smartchild
Joined: Dec 2008
Posts: 523
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.

Joined: Jul 2008
Posts: 14,344
Likes: 19
Wiki Master
Offline
Wiki Master
Joined: Jul 2008
Posts: 14,344
Likes: 19
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.



We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn

https://ddue.uk
Joined: Dec 2008
Posts: 523
Likes: 1
pacef8 Offline OP
Smartchild
OP Offline
Smartchild
Joined: Dec 2008
Posts: 523
Likes: 1


Moderated by  Mark 

Link Copied to Clipboard
Random Wirral Images

Click to View Topic.
Newest Topics
Facial recognition coming in supermarkets?
by Excoriator - 27th Mar 2024 10:52am
Hot Spot Chippie Broadway
by Excoriator - 26th Mar 2024 7:57pm
Bolts at Bebington Road
by Excoriator - 23rd Mar 2024 9:48am
Netflix 3 Body Problem.
by BultacoAstro - 22nd Mar 2024 8:04am
Tall Brick Chimneys
by diggingdeeper - 16th Mar 2024 11:56am
For Sale & Free
Wisper electric bike. 36v .
by Dilly - 21st Mar 2024 7:36pm
This is Elvis
by GingerTom - 17th Mar 2024 2:37pm
Member Spotlight
Dilly
Dilly
wallasey
Posts: 8,973
Joined: July 2011
Today's Birthdays
There are no members with birthdays on this day.
New Wirral Info
Facial recognition coming in supermarkets?
by Excoriator - 27th Mar 2024 10:52am
Hot Spot Chippie Broadway
by Excoriator - 26th Mar 2024 7:57pm
Bolts at Bebington Road
by Excoriator - 23rd Mar 2024 9:48am
Get your Money Tree ready
by keef666 - 22nd Mar 2023 12:27pm
Restaurant/pub with outdoor seating - Bromborough
by CarterUSM - 7th Aug 2020 7:59pm
News : New Topics
Gaza
by diggingdeeper - 29th Oct 2023 9:28am
Lost river (Well, brook really)
by Excoriator - 10th Sep 2019 8:50am
New Enthusiast Forums
Netflix 3 Body Problem.
by BultacoAstro - 22nd Mar 2024 8:04am
Xbox
by TudorBlue - 3rd Mar 2024 8:48pm
Wiper mechanism needed
by Peter0787 - 20th Feb 2024 4:07pm
What song are you listening to?
by - 24th Jun 2007 9:06am
Popular Topics(Views)
5,069,758 WIKI WALK CHAT
4,013,817 Spotted!
Powered by UBB.threads™ PHP Forum Software 7.7.5