my little worklight

[blackdragonx1186]

I was a bit tired of using high wattage work lights to do various things, like work on my car at night when its not blistering hot outside. So, i decided i wanted a LED based light, with tons of flood, and just a hair of throw. What i have currently is 5 Q2's, wired in series. I have a Dell 90W laptop supply, which is 19.5V and 4.62ish Amps. I plan on a total of 30 Q2's, which will give me ~90W of light, with cheap SMO reflectors on 10 for a bit of throw. Once i get my hands on a tripod, I will have a versatile light!

Currently, they are pulling a little over 8W each, as I'm not using a resistor. I dont plan on fully using this until i get all the LED's, just gotta wait for the wallet to refill...:sick2:

Even with just Q2's, the output is impressive. I cant wait for all 30. Heres a couple pics. I dont have any beamshots, yet.

http://i23.photobucket.com/albums/b380/blackdragonx1186/lighting/P8151805.jpg

http://i23.photobucket.com/albums/b380/blackdragonx1186/lighting/P8161806.jpg

I know, they are not evenly spaced out. But when they are running, you dont really want to be looking at them anyways:candle:

 

[SFG2Lman]

looking good so far man, i can't wait to see how this turns out and for some good ole beamshots, so what made you go with the Q2? I'm rather new and I was just wondering if they have a distinct advantage other than price. Good Luck!

 

[tebore]

Do you even need 30? That's going to be like 3000lms of light at 30 watts. At 90 watts that'll be like 5000lms.

 

[Illum]

I don't think that piece of heatsink you are using is anywhere near adequate for passively cooling 30 LEDs, I think it'll satisfy the thermal requirement of about 10, but thats depending on what current you choose to drive them and how long you want to leave them on.

 

[roguesw]

You probably want to mount copper cpu heatsinks at the back and also fans to help with cooling.

 

[blackdragonx1186]

Do you even need 30? That's going to be like 3000lms of light at 30 watts. At 90 watts that'll be like 5000lms.

do you really need to ask that? :p

I don't think that piece of heatsink you are using is anywhere near adequate for passively cooling 30 LEDs, I think it'll satisfy the thermal requirement of about 10, but thats depending on what current you choose to drive them and how long you want to leave them on.

once i get them ill run them until i feel they are getting to warm, IE check the temp of the alu. If needed I will then get some heatsinks and fans and attach them. The aluminum is 1/4" thick, and 11.5"x6" in size.

You probably want to mount copper cpu heatsinks at the back and also fans to help with cooling.

Yep.

As for asking why i used Q2's. Well, price. But, after i ordered them i kicked myself quite good as i didnt think about using SSC P4's, as they produce even more light with the same wattage. Ah well, I do have another power supply thats just sitting... :whistle:

And I will definitely post lots of beamshots at various distances.

Here, ill go out and take one now.

http://i23.photobucket.com/albums/b380/blackdragonx1186/lighting/P8171810.jpg

Distance to the tree is roughly 60 feet. Keep in mind Im using a crappy point n shoot, so its over-exposed by roughly 15%.

 

[tebore]

once i get them ill run them until i feel they are getting to warm, IE check the temp of the alu. If needed I will then get some heatsinks and fans and attach them. The aluminum is 1/4" thick, and 11.5"x6" in size.

That'll be within a minute at 3 watts each (we are talking about 30 stars). You might as well start planning for extra heatsinking or start thinking about how to dim them to 1watt each. I wouldn't suggest using a resistor as that's a lot of power/heat to dissipate.

 

[blackdragonx1186]

That'll be within a minute at 3 watts each (we are talking about 30 stars). You might as well start planning for extra heatsinking or start thinking about how to dim them to 1watt each. I wouldn't suggest using a resistor as that's a lot of power/heat to dissipate.

humm, alrighty then. thank you sir!