FS: Blue LED's (DIY moonlights)

[Whoyah]

I will take a group of 20 if you stil have them.

[dakar]

Ill take $30 dollars worth, or whatever you can spare for that ammount.

Let me see just how many I have left in the morning and I'll let you know...

Gonna try and make a full LED hood for my 34g tank, any info on where I would be able to get daylight LEDs' ?

I can check with my supplier and see what he has available for white LED's, last order I almost ordered 300 of the 130,000mcd 10mm LED's to do just what you are thinking about... last time I checked they ran about $70 for 100.... But they are crazy bright! Might take a couple of days to get a quote... but if you are serious I'll shoot him an email and let you know my price and how quickly I can get them. It's always great to order from the same fella and in huge bulk shipments to get them for cheap!

[dakar]

Ill take $30 dollars worth, or whatever you can spare for that ammount.

ygpm

YGPM back now... one where I was not 1/2 asleep.


pass1over YGPM too!

[melev]

Are you sold out yet? What about using 6VDC 400mA power supplies? I'd probably like to buy 20 for $4, plus shipping.

[w7afm]

I could go for 100 of them. Let me know your information and I will get with you through PayPal.

Bob

[dakar]

Bob - YGPM

[melev]

Are you sold out yet? What about using 6VDC 400mA power supplies? I'd probably like to buy 20 for $4, plus shipping.

Did I get skipped on purpose?

[dakar]

Are you sold out yet? What about using 6VDC 400mA power supplies? I'd probably like to buy 20 for $4, plus shipping.

Did I get skipped on purpose?

I really REALLY tried to over look ya... YGPM, and BTW 6Vdc @ 400ma will do just fine for up to 12 of these LEDs in parallel, to make up for everlooking you here's how the array should look.

• use 1/4W resistors
• the array draws current of 360 mA from the source.

Anyone needing or wanting a schematic drawn up with the proper resistors need only provide the voltage and current capacity of your power supply and I'll post it here for ya.

[melev]

Looking at your drawing, I think I have the LED's larger internal part described incorrectly in my thread. I thought the bigger side was the + side. At least I have the resistor on that side, where it belongs.

[dakar]

Looking at your drawing, I think I have the LED's larger internal part described incorrectly in my thread. I thought the bigger side was the + side.

*Almost always*, the cathode (-) is in fact the larger side of the LED and anode (+) the smaller. I've only seen a few much older ones where this is not the case. Electons flow from the from the cathode to the anode (may be opposite to what some people think... DC electricity really travels from negative to positive, no sense in hijacking my own thread, but that's a whole other subject).

Generally if they don't light up, you've got them backwards, unless you forgot the resisitor and let the smoke out.

At least I have the resistor on that side, where it belongs.

Actually it really does not matter which side of the LED the resistor is placed, so long as it is in series with the LED, it's function in this application is merely to limit the amount of voltage able to pass through the LED. Excess current is converted to heat in the resistor, so depending on the amount of current that must be limited, the resistor must be rated accordingly. For example in the circuit above using a 6vdc power supply each resistor dissipates 90 mW, so 1/4W is fine.