Stupid sandwich questions

[John N]

I want to put a sandwich in a couple of lights and am not sure what the correct items to use. Any help would be appreciated.

#1 - for 3 x AA cells, ~4.5V. I would have just ordered a drop in module, but they all indicate a max input voltage of 3.1v. I'm not quite sure I understand this since the Badboy boards are rated 9V input max.

#2 - for 12 x AA, par/ser for 9V.

#3 - I want to use NX05 optics with a 1W LS. I never paid attention what the difference between HD and LD. Do both work with the NX05? One better than the other? I assume the SE has that funky lens built in and does not work with the NX05. Also, how do you rank the qualities of the LSes available from Wayne?

Here are the ones I see:

LXHL-BW01 White Luxeon Batwing (LD) Emitter LED (BIN Q3_)
LXHL-BW01 White Luxeon Batwing Emitter LED (BIN Q2_)
LXHL-BW03 1W Warm White Luxeon LD Emitter
LXHL-MW1C 1W White Star Bin code Q4H (LD)
LXHL-MW1D 1W White Star Bin code R2L (HD)

Thanks,

-john

 

[dat2zip]

#1. The reason the modules are rated for 3.1 is that both the Madmax and Badboy are step up converter boards. That means that the battery voltage must be less than the LED Vf voltage. Since 1W Luxeons Vfs are in the range of 3.0-4V you cannot use a battery voltage higher than about 3V.

(Note: The rating is the absolute max. In a 5W configuration the maximum input voltage is around 6V.)

#2. 9V is higher than both the 1W and 5W Vf so the beat choice here is a Downboy which is a step down converter board.

I'll let others speak for #3.

Wayne

 

[MenaceSQL]

Wayne, so with #1, you cannot use L91 lithium AA's?

 

[dat2zip]

3AAs. Sure, if it is a Downboy.

With a 1W Luxeon (~3.6V) input battery voltage must be less than that. So, depending on the Vf bin code of the specific Luxeon in hand, you might be able to go as high as 3.4-3.8V, but, not beyond that. 3AA is 3 * 1.2V/1.5V or ~4.5V.

This will fry the Badboy converter board.

 

[MenaceSQL]

Oops... Wayne, I was meaning running two L91's on a BB or MM with a one watt luxeon... is that alright? sorry for not reading the whole thing through first. /ubbthreads/images/graemlins/ohgeez.gif

 

[dat2zip]

Two L91s are excellent.

Any two cell combo is fine as long as the total voltage is not over ~3V.

That includes NiMH, NiCD, Alkaline, L91s...

 

[MenaceSQL]

/ubbthreads/images/graemlins/grin.gif Hate to keep dragging you on Wayne but the L91's are suppose to be 1.7v each. I believe some people even say they're like 1.75v each. So total voltage of two is ~3.4v to 3.5v. That is over your recommended 3v. Would this still be ok for your BB and MM babies? Ok, I'll make this my last question... I hope. /ubbthreads/images/graemlins/tongue.gif Thanks Wayne. /ubbthreads/images/graemlins/bowdown.gif

Sorry for hijacking your thread John. /ubbthreads/images/graemlins/twakfl.gif

 

[dat2zip]

That's the open circuit voltage. Like Alkaline and even NiMH the battery voltage sags when a load is applied.

To be more precise, there is an additional diode voltage that needs to be added in to the equation.

Thus the absolute max battery voltage is Vf + 0.4V.

If you got a true J,H,I Vf bin code, you might be experiencing some DD. I would doubt this since driving higher currents into the LED raises the Vf.

L91s are very close, but, shouldn't be a problem.

The majority of the modules sold to date have been Vf bin code K and L. A few Hs and as far as I can recall, no Js.

 

[John N]

Wayne, thanks. Can someone comment on how to pick the LEDs?

Thanks,

-john

 

[Stainless]

I guess I am a little slow, but I am definately in the correctly titled thread. /ubbthreads/images/graemlins/grin.gif

I have one of these:
Madmax Plus Sandwich Module kit Q3

Can I put it in a CNC-123 with a single Cr123 which measures at 3.17 volts? (Will that be brighter than running the same module off of a single AA?)

Is that where the whole business of "the open circuit voltage. Like Alkaline and even NiMH the battery voltage sags when a load is applied." comes into play?

 

[dat2zip]

The modules work fine on a single 123.

yes, the 123 sags down to 2.7-2.9V depending on the MFG of the battery when driving the module.

(Nice rabbit...)

 

[BentHeadTX]

Wayne,
I was pondering putting my red Luxeon 1W on a Madmax sandwich and running it with a single AA cell. My Stoplight (CNC Dan) will hold sandwich. I would assume running two AA batteries into a Madmax equipped Red would be lethal.
Anyone have a red Madmax?

 

[vcal]

[ QUOTE ]
BentHeadTX said:
Wayne,
I was pondering putting my red Luxeon 1W on a Madmax sandwich and running it with a single AA cell. My Stoplight (CNC Dan) will hold sandwich. I would assume running two AA batteries into a Madmax equipped Red would be lethal.
Anyone have a red Madmax?

[/ QUOTE ]
Yes, and the MadMax will take it but don't accidently shine the output into your eyes! :O

 

[Stainless]

datzip:
Thanks for the answer, and I'll pass your compliment along to "the rabbit". /ubbthreads/images/graemlins/grin.gif