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Discussion Starter · #1 ·
i have a complete hope vision 2 mk1 set of lights with a dead micro switch on the board

i was not very satisfied by the output of my light before the switch packed up (lumen envy) so i want to upgrade the unit whilst repairing it.

my plan is to use

2x http://ledsupply.com/creexpg-w417.php - LED's
2x http://ledsupply.com/10507.php - optics

i want to drive these (or similar) from the hope 7.4v li-ion batteries.

can anybody recommend the the right PCB to do this ?

the PCB does not have to fit inside the unit as I am planning an addition to the back of the led mount board / heat sink.

is there a better LED set-up to use Lumen wise?

I'm in the United Kingdom which may affect supply and so component decisions

any help / opinions / suggestions appreciated
 

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Discussion Starter · #10 ·
cheers folks

As much as I can gather the lflex driver seems to have everything I'm looking for so.........

just to check

if I use 2 X cree XM-L wired in series I can drive them using a lflex driver ( http://www.taskled.com/techlflex.html )

has anyone in the UK bought one of these lflex drivers?

what do we think about an old computer CPU finned heat sink in full airstream on the handle bars for the driver? got to be more than enough right?

yetibetty, do leds.de supply with the LED mounted to the star PCB or just with them?

if they don't come pre-mounted then I'll get the LEDS from led-tech.de as it states that they can be supplied mounted on the star PCB's

I'm all for minimising soldering if possible.

and finally thermal glue

should i get ArcticSilver thermal glue?
( http://www.leds.de/en/High-Power-LE...es/ArcticSilver-thermal-adhesive-2x-3-5g.html )

or is there something better / just as good and cheaper?

once again much thanks for any help
 

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H6flex is a nice driver but its bloody huge and a fair bit more expensive. Using 7.4v battery with 2 x XPGs/XMLs the Lflex will be great.

Ironcroft, I'm in the UK and I've got a couple of Lflex's. Got one driving a 2 x XML helmet light from 7.4v using Ledil LXP RS lenses.

Lots of light but overheats my housing at anything over 2A. Might re-deploy the XMLs to a bar light (which is what they were originally bought for) and replace with a pair of XPGs driven at 1.5A originally bought for the job.

From memory the Hope 2 is a neat little lamp but doesn't have huge surface area so you might have to be realistic about how much power the heatsink can dissipate. However, even 2 x XPGs at 1.5A will be a big improvement.
 

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Discussion Starter · #14 ·
Thanks for all your pointers


Ordered the XML's + consumables from the Germans

emailed TASKLED

Going to knock out a heat sink extension for the LED mount on the lathe tomoz lunchtime in preparation. I'm planning on using thermal compound at every joint all the way to the bars to loose a wee bit of heat that way, and if (when) all this fails to lower the heat enough there's nothing stopping me TIGing an extension on the back of the light.

Contemplating a nice ali housing for the lflex and switch too :) watch this space........

Thanks again
 

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Discussion Starter · #15 ·
I'm now the proud owner of a 1950 lumen (theoretical) bike light

Lflex is programmed in UIB2 multimode

The light housing gets warm fairly quickly if left on high when stationary but is fine if pressed down to a low setting when stopped.

really impressed with the user friendly-ness of driver operation and programming.

a photo of the set-up before final tiger seal waterproofing,

compleated unit not seal yet

and after when installed on the bike.

setup on bike

I've only got a phone camera but i'll be posting in the beamshot thread when i can get a friend with a nice SLR out in the dark.
 
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