I need simple help. New to this

I'm making my very own 240 watt LED grow light, and I'm unsure if i need to use resistors or not. I'm using 3 watt led's, 66 red, 10 blue and 4 white, but I'm really unsure if i need to use resistors because i don't want to plug it in and watch them all blow out.
Im using this power supply:
http://www.ebay.com/itm/12V-20A-240W-Switch-Switching-Power-Supply-Driver-For-LED-Strip-Light-110V-220V-/170884949622?pt=LH_DefaultDomain_0&hash=item27c9896676

Do i need to add resistors to the equation or do i simply wire it up and go?

I think you got the wrong driver. We're mixing LED strips with high power LED's here.

For high power LED's you need to find out what current you want to run the LED's at. For 3W chips you're probably looking at 500-750mA? As for voltage, you add all the voltage ratings of the LED's up. For you it'd look like:

66 x (voltage of Red LED's) = X
14 x (voltage of Blue and White LED's, assuming they are the same) = Y
X+Y = total voltage

Now we need to find a CONSTANT CURRENT LED driver that's rated at the mA you want and a voltage rating range that your total voltage falls within. Many LED drivers are rated at, say, 50-75V, so if you're total voltage was 66V then we're good to go since that's within the range.

And NO resistors!

To estimate the wattage of your panel take the current you've chosen to drive your LED's at and multiply it by the total voltage.

Hope this helps. Good luck and stay safe.

every single one is 700 mA, and the forward voltage for reds are 1.8V -2.4V blues are 3.0V- 3.8V, and whites are 3.5V-4.2V. So your saying i do the math like this:
66x 2.4V= 158.4V
10x 3.8V= 38V
4x 4.2V= 16.8V
All together making 213.2 Volts

I've been looking for a while now, my eyes are starting to burn! haha, could you help me find a suitable driver? everything im coming across is dimmable. and also, is it possible to use more than one driver, to combine to reach the voltage goal. thank you so much btw.

Yeah, that's a lot of volts. This is why I think you see a lot of LED panels that cluster groups of LED's into "modules" with separate "buck" drivers for each module.

http://www.aliexpress.com/item/MeanWell-150W-700mA-21-215V-Single-Output-Switching-Power-Supply-Dimmable-Waterproof-LED-Driver-HVGC-150/731710757.html
That's what you "need" but voltage input minimum is 180VAC. If you're in America you're probably running 110-120VAC. I'd suggest making two smaller panels.

http://www.alibaba.com/product-gs/862023490/Waterproof_IP67_120w_700ma_constant_current.html
That will power your Red's. Just throwing that out there.

To find a suitable driver try googling "700mA LED driver (xxW) Aliexpress" where (xxW) is the total Wattage for the panel you want to drive (most likely half 213.2 Volts x .7W if you're making two identical panels). If you want to make a single panel still and simply wire the Red's separately from the Blues/Whites then perhaps the second driver I linked is an option. Digikey has some options, although their prices tend not to be the best. Check eBay, too, shop around for the best price. Meanwell is a good name brand if you can find one that's priced within reason.

Edit: You can also do some fancy things with on/off switches, multiple LED drivers, and tricky wiring in order to create different ratios for perhaps vegging/flowering needs. You might be able to save some money this way with perhaps three or more smaller, lower wattage drivers. Hopefully others can chime in with ideas, I've never made a panel like this.

Do you think this one would work? It's reasonable price and has dual output so I could run two circuits off one driver, I don't know if it will work but I hope it does because I need to be ready in something like 2 weeks or so so I can begin to grow.

http://www.amazon.com/gp/aw/d/B006IJE0X0/ref=mp_s_a_1_1?qid=1368733168&sr=8-1&pi=SL75

Look.....
I'm one of the " bad " guys around here ...
Difficult to follow ....

But I will try to help you a bit ....


I'm making my very own 240 watt LED grow light
.......

Well ,easy to say ....


Take it step by step .....


1- Forget " Wattage " of leds ....

You 're going to use 80 leds ,driven at 500 - 700 range (<= hot issue ) .....


2- ...Leds are diodes and are to be connected in series ,in order to make a panel ....

Each led has a Voltage Drop .

So,if you connect them in series ,Vf (Forward voltage or led's voltage drop ) of every led ,adds up to a certain sum ...

For your panel :

66x 2.4V= 158.4V
10x 3.8V= 38V
4x 4.2V= 16.8V
All together making 213.2 Volts

There is not a Constant Current driver to supply that kind of voltage ....

Constant Current .....


Leds heat up ,as they operate .....
Their forward voltage drops ....
So along with forward voltage ,the current that diode "sustains" , drops ....


If now you use a Constant Voltage Power regulator (for led strips ) and resistors as "current limiters " ,several problems will arise ....

- You will have to set strips of leds with Vf total a bit less than 12 V ..Few leds per strip ..
That will lead to use of many resistors ...Efficiency will drop,as heat is generated from resistors ...

-You will have to arrange the 80 leds ,in such way ,that you 'll get the most "blended" light possible,
from the three different types of leds used .(Red-Blue-White )


-Many strips connected in parallel ,will rise Current running the main supply wire ,into pretty high levels ...
You will need really thick wiring ...I mean really thick ....And a power supply that can supply that ampere ...


-Constant current drivers ,have an internal "line " monitoring circuit ...
Constantly ( thousands of times per second ) they measure the led strip's Voltage drop ...
And adjust their output voltage ,so that the current always remain constant .....

Meaning ....

10 leds in series => leds in order to "allow " for 700mA current to pass ,will drop the voltage ~35 Volts ..
That's when they are cold ...

Once they get heated ,Vf drops from ~35 V ,down to ~29 Volts ...

-if a CV regulator is used along with resistors ,then current is at 700mA when Vf was ~35 Volts ....
Now Vf is ~29 ...
6 volts over the limit ,that the resistor was calculated and set ....
Now ,there is not 700mA passing ,but a whole lot more ...
Leds are overdriven ....They can fry now ....

Constant Current driver reads that ,and drops the voltage at a level ,that leds allow 700mA current to go through ,without the use of a resistor ...

Constantly protecting the leds from being over-driven .


So ,you will have to take into account :

Cooling -heatsinks used ....

and led arranging to get a good blende light ....

Say 4 modules ,each with it's own heatsink and CC driver ...

Each module will have 20 leds ...

17 x reds
2 x blues
1 x whites

Vf = 40.8 + 7.6 +4.2= 52.6 V ....

You need a Constant Current driver that can supply up to ~60 V, in a led series strip of ten

60 * 0.7 = 42 Watt .....

YOu need a 45-50 Watts ,( Output : 700mA ,60 Volt max ) CC driver .
Four of them ...


Something like that (73 volts max ) : http://www.ebay.com/itm/Constant-Current-Driver-18pcs-3W-High-Power-LED-12-18x-3W-Driver-/121076647727?pt=LH_DefaultDomain_0&hash=item1c30bb072f


Powered Either directly from AC mains ( 110 / 220 AC ) or from a DC power supply ( 24 / 48 / 56 Volts ) => "buck" aka DC/DC Constant Current led drivers


But ...
Sit and think carefully ...
Led arrays -led arrangement-cooling-driving -placing/hanging -protecting ....
...
Good Luck .

No, I wouldn't say your the bad guy, some people just don't recognize a good lesson when it's given to them. Thank you so much. I really had no idea until you guys spoke up.