LED flood light using a 18v drill battery

[EyesOfAHunter]

Hi Guys
I am trying to make a floodlight with the batteries from my drill.

I have 18v prolithium AEG (see links) for my tools
and I have ordered 10x 18v COB SMD LED Light Lamp Bulbs (see link).

I would like to build these into my toolbox, so that I have a light stand while working.

So my thinking was to use a DC LED Driver Module(see link), set at 17v & 300mA then placing the COB's in series, mounted on a metal plate.

I would also like to use a short circuiting switching arrangement that will allow me to turn on one or all of them, but am unsure how this would affect the current usage/the driver module .


So I am asking for comments and feedback.
What do I need to think about?
Will this work?


links:

http://www.aegpowertools.com.au/products/batteries/

http://www.aliexpress.com/item/10pc...B-SMD-LED-Light-Lamp-Bulb-hot/1293964355.html

http://www.aliexpress.com/item/DC-L...DC-Buck-Converter-Power-Supply/556968768.html

 

[discomark10]

Think your a lil over the max output on the driver 10x300ma=3A, Also the battery wont last to long with that load, is it more of a torch than a flood light?

 

[(*steve*)]

18V LEDs and 18V batteries won't mix real well (generally).

You need some form of driver for the LEDs and these typically run from a supply voltage somewhat higher than what the LEDs require.

As an example, 18V supply --> controller --> 12V LED.

The COB LEds are not a single LED, they're a collection of LEDs in series/parallel. They're all on the same substrate do they share current pretty well. multiple of these can be placed in series, but placing them in parallel is probably not such a good idea. Generally speaking each one (in this cae) should have a driver, or you should have something to ensure they share current better (and in this case placing them on the same heatsink would be a great help).

The power supply you list will not be suitable unless you have a higher input voltage (or lower voltage LEDs). As you can see from the price of this module, having one per LED would be expensive.

Your main problem right now is the voltage.

 

[EyesOfAHunter]

@discomark10
its more of a torch
how long are we talking?
If I used 2 drivers with 5 LED's each would that work?
or this one
http://www.aliexpress.com/item/DC-4...Constant-Current-Solar-Battery/615725223.html


@(*steve*)
I would love to run these off my drill battery but the main goal is light.
would the following power supply do the job for all 10 in series?
Next would I still need the driver?
Also you mentioned that have one driver per LED, is this the case in series?

http://www.aliexpress.com/item/Free...r-Adapter-with-EU-Plug-15V-16V/682233481.html

 

[(*steve*)]

If you have ten LED modules in series then the voltage you require is ten times what is required for one of them., So, if each is 18V, you require 180V.

I would be seriously considering a single COB LED that was rated at 50W (or whatever you require) and then finding a driver and appropriate voltage source.

Your 18V battery probably ranges from about 15V to 21V (flat to fully changed) so it is perhaps ideal for 12V LED modules. These are generally fairly low in power (say 3W). If you place a number of these in parallel, all mounted on the same piece of aluminium, and each with a low value series resistor (that will drop about 0.5V at the rated current) THEN toy could operate them from a constant current source from your battery.

2W at 12V is about 250mA, so the resistors would be around 2 ohms. If you have 10 of these, you need a 2.5A constant current driver (preferably a switch-mode device.