batteries and driver for an led torch

[athoms9]

Hi all

I'm new here and new to building flashlights, so bare over with me for my newbie questions ;P

I'm planning an led build torch with roughly these leds:

i'm thinking about using 4 of these leds for the beamspot : Cree XR-E 7090 Q5 Emitter, White, 228 Lumen, 90°

and 1 Cree MC-E LED, M bin, Star, White, 752lm, 4 chips, 110° for the flood


which rechargeable batterypack would u guys advice if i want 2 hours of runtime on max? and is it at all possible to squeze in that amount of battery power in a handheld torch?

2ndly is it possible to have different modes like this?:

1st mode - 100% on all leds
2nd mode - 50% on all leds
3rd mode - 20% on all leds

4th mode 100% on the BEAMSPOT LEDS only

5th mode 100% on the FLOOD LED only

thanks in advance

/Anders

 

[Ajay]

Hey,

What driver(s) will you be using? Battery recommendations will vary depending on the input voltage of your driver(s).

Also I hope you have some good heat sinking for that project. What body will you be using?
EDIT:

check this site for some advanced circuit boards. That's a pretty advanced project, I see you have only 5 posts. I was just wondering if you have experience with other light projects. I am a newbie myself.

 

[TorchBoy]

Handheld means a lot of things to a lot of people. I figure you should be able to do it with less than 50 Wh of batteries. On full you could need about 30 AA Eneloops for a reliable 2 hour runtime. It would be hand holdable, but getting heavy, so I guess you'll go with lithium. Unfortunately that's out of my field.

As for driver comparison, there's a nice list here.

 

[yellow]

define "handheld"

for 4*single die led and 2 hours on full, You need (roughly) 4 pc. of 18650 cells
for one quad led and 2 hours on full, You need (roughly) 4 pc. of 18650 cells
makes 8 cells, thats bike light battery pack size and weight.

reduce to 4*single die or 1*quad, those will be bright "enough" and You will have enough spill also.
The quad will be easier to build.

For powering, I would go for a 2-cell Li-Ion pack (7.2 V), step-up driver and led in series.
For the whole package (4*single + 1*quad), 2 drivers seem to be the only possibility.

As drivers I would use 1 (or 2) SHARK (or blue shark) from Sandwich shoppe, the levels by adding external resistors, the whole switched by a rotary switch.
(... the project is doable, but imho not beginners stage. Maybe too complex atm? Try building 4*single or 1*quad 1st to learn the whole thing)

 

[TorchBoy]

athoms9, do you know what the 90° and 110° figures in the LEDrise LED titles refer to? Do you have any optics/reflectors in mind yet?

Hm, don't think much of the shipping costs of that LEDrise site. Economy express is almost US$300,000. :faint: I'm heading back to DX right now.