More advice needed please...

Ok I am getting my head around it all now, but im still a newbie. But im up for having a go.

I would like conformation from someone who knows there stuff that the following list of parts will all work together. It would only take a minute to check this for me, as i think i have it right but im not totally sure....

The plan is to build a light with 4 led's running of 4 seprate drivers and 1 battery. With the drivers all wired in paralel to the battery. All hosed in a custom made underwater casing.

From DealExtreme:
sku 01885 - 1050mA Regulated Circuit Board x 10
SKU 01915 - 48.16mm 4-LED Reflector for Cree Emitters
SKU 02394 - Cree XR-E Q5 Emitter on Premium Star (228LM at 1A)

And from batteryspace.com:
Polymer Li-Ion Module: 3.7 V 8000mAh - Prewired with PCB (PL8059156)
http://www.batteryspace.com/index.as...OD&ProdID=3903


And from : www.chilledpc.co.uk
Enzotech Forged Copper Northbridge heatsink
http://www.chilledpc.co.uk/shop/prod...roducts_id=487
I rekon that by very slightly overdriving the Led's and arrangimg them in a set of four i should be looking at around 1000 Lumen right?

Do you think it would be good to silver spray paint the back side of the reflector?

It should be noted that this is for scuba diving. I only need 1 mode on or off....

Thanks in advance for your time... Gavin.

Yes, around 1000 lumen.

Painting the back side of the reflector won't do much performance wise. Also most optics are more efficient the reflectors.

I'd actually use these buck drivers and a 7.2v battery. The light will be regulated but will be dimmer. Around 800 lumen.

Why would i wont to run my light design dimmer than i possibly could? You need max power when your in sero viz, 150ft under the waves.

A tad confused about the battery / batterys now.

What's going to be the best to drive 4 of the 3.7v cree Q5's at 1050 millamps in parallel? I need a minmum 2 hours run time with max output.

What you have before works. But I'd use a higher capacity battery for more runtime if you don't mind the extra weight.

The drivers will drop a bit of voltage from battery to LED, I don't remember how much though.

So seriously what's going to be the best battery to drive 4 * 3.7v cree Q5's with the above mentioned 1050 millamps drivers in parallel?

I have to have 2 hours runtime.

And no i dont wont to buy the latest mini nuclear reactor. Serious answers please, What is the absolute ideal battery for me....

Also i was talking through my housing ideas with my local specialist company, and they said if it all works out and it's really good they would be intrested in producing them.

The sales pitch would be to do a 1000 lumen 4 led 2 hour scuba lamp and charger for under £100. Dont think there would be much competion for a lamp this bright at this price level in the scuba market. They are usually way more expensive....

why the parallel wiring + the 4 circuits?
shure, cheaper, but more things to break, more different wiring

the 4 wired in series + SHARK. Imho safer


.. anyway, both setups will draw about 4 Amps min.
With that battery there will be no 2 hours - probably about 1 h 45 min (if everything is perfect). Calculate 1:30 to be on the safe side


PS: as a diver size+weight does not have to be Your main concern, or? :thinking:
the better battery choice were a 7.2 V Camcorder Pack, say a Canon BP945 or such.
With a 6600 mAh there are "easy" 3 hours possible. A smaller 4400 pack gives about the 2 hours needed.
advantage:
1: if someone has a camcorder already, charging is no prob.
2: the packs are CHEAP




PPS, there is one major problem with the pieces from DX: price and quality come together.
When I look at the optic linked, I think: "would I like to wears goggles from the "1 $" shop, or from a respected optical maker?"
This piece is crap and will not lead to something You like, when You know what better focusing devices do.
But it will lead to a very good priced light, thats for sure.

Seprate parallel wiring for better redudancy. If a driver or led blows you can carry ob diving....Also lower voltage battery pack needed.

Cant find ayg good quality quad or even 6 optics or reflectors any where, i have spent hours trawling the net for them??

Checked out camcorder batts and they all have pretty low capacitys..

So im going to go with a 6v battery pack of around 8000mah. I have no idea if this will work but the theroy sounds good to me?

As for the above mentioned crappy optics, i have spent the last 4 hours looking for a better quad optic, and i havent found one yet, if anyone knows of good quality branded ones, please can you let me know asap....Thanks.

I thought you meant reflectors.

Silvering the back of reflectors won't do much, while silvering the back of optics will make them less efficient.

Over all, optics are much more efficient the a reflector + window combo.

Are you looking for a Quad optic or 4 seprate optics, both shouldn't be too hard to find. Cutter has a few(so does DX). There are also many european sites that have them too, I don't remember them though.