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Aquarium lighting hood. Will it work?

 
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Xaoey
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Joined: 08 Jun 2008
Posts: 1

PostPosted: Sun Jun 08, 2008 1:29 am    Post subject: Aquarium lighting hood. Will it work? Reply with quote

Hi guys, i'm new to wiring LEDs. The last few days I've been looking up info on how to do it. Anyway here's where I need some advice as to whether this is going to work for me or if I need to edit my wiring (or add parts).

My project is an aquarium light hood. What I want it to do is:
1. turn on 6 white LED's. 4 will be the 3mms and 2 will be 5mm
2. turn on 2 blue LEDs. Both will be 3mm
3. Be able to turn on all white LEDs separately from the blue LEDs
4. Powered by plugging it into the wall.

Just to give you a visual here's what I want to happen:

Here you'll see the white LED's turned on but not the blue.

http://i19.photobucket.com/albums/b182/xaochan/Projectfishtank_white.jpg

and here you'll see the blue LEDs turn on but not the white.

http://i19.photobucket.com/albums/b182/xaochan/Projectfishtank_Blue.jpg

So onto my circuiting. Here's what I came up with:



What I meant to do was connect my LEDs parallel but I don't know if I did it correctly with that particular switch or not. The switch i'm using is a single throw double pole switch. And i'm using a 470 ohm resister for each of the LEDs.

The thing that confuses me most is that i'm planning on using an old AC adapter I have lying around. It's output is 9v. Anyway I saw a few similar projects to mine. One was a lamp and they used an LED driver because they were plugging it into the wall. But the LED they were using was much more powerful than the ones i'm using so i'm not sure if i'd need to use a LED driver regulator.

Finally even if I did need to use one i'm not exactly sure how to wire it to what I have going on right now, or which regulator to use.
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Turd
HG Ruler


Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Sun Jun 08, 2008 11:19 am    Post subject: Reply with quote

That looks like it should work Very Happy
I would test it first with 1K resistors. A lot of the time adapters will put out more voltage than they say.


eric
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walruslemon
Newbie


Joined: 05 Jul 2008
Posts: 4
Location: Australia

PostPosted: Sat Jul 05, 2008 7:29 pm    Post subject: Reply with quote

Yes, agree.
The LED 'driver' chips are for efficiency.

The resistors will be dissipating heat
Power (Watts) = (Current (amps)*Current(amps)*Resistance(ohms)

Current through each LED = (9volts - LED voltage drop) / 470 ohm resistor.

So maybe (9volts - 2volts) / 470 = around 15mA through each resistor-led combo.
The resistors will be dissapiting (.015 X 0.015 X 470) = 0.1 Watt, so they will be fine.

If your power supply is actually 12 volts then,
LED current = 21mA.

mmmm,
I reckon, if they are 30mA LEDs', you can use smaller resistors, maybe 300ohm, and get alot more brightness.
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