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Old 05-07-2012, 09:43 PM   #1
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DIY LED Fixture

So, Walking the dog, and what do I see... A nice piece of aluminium! I think to my self... Gee... that would make a really nice LED heatsync. I bet its a bunch of pieces.

on my way back, I look at it... and its long and one solid piece!

Heres some pictures:






So, the ONLY flaw is that it's not completely flat on the bottom, but if I stagger the LED's, I'm thinking it'll be perfect to put about 6 LED's to give me the ability to grow some higher light foreground plants.

Its going to be on the cheap, and its going to be mounted inside the cabinet I already have. Do you think with 6 3Watt LED's i'll need active cooling on this sucker?

Also... What are the odds? its 47 inches long. It'll fit PERFECTLY inside my home made cabinet.

Destiny I think. Going to make some LED lighting
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Old 05-08-2012, 09:32 AM   #2
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So, More research/puttering done.

I'm thinking between 5 and 8 Cree XP-G Neutral White LED's, because then I can stick with One Dimmable ballast, and keep this project on the cheap.

Potential Parts List:

Dimmer/Constant Current Driver: $34
Mean Well ELN-60-27D dimmable driver - Rapid LED

5-8 Cree XR-E Neutral White LED' with 40 degree Optics $6 Each
CREE XP-G Neutral White LED with 40, 60, or 80 degree Lens - Rapid LED

9 Volt Wall Wort for Diming:
(I have this laying around from electronic gizmo's that have gone the way of old yeller)

A potentiometer for Dimming the 9 Volt signal:
(This, I'm not sure of. What kind of load? I'm assuming because its just a "signal" that it doesn't have to be beefy. Also, I can't seem to see any Voltage rating on Pots. Does that mean it just goes by Resistance? I would think that if you put 230 volts through a small one, it'd just pop. Anyway, the decisions I HAVE made for this are Single Turn, and Linear curve.

Optics: 40 Degree. Below are pictures of various senarios. I don't have a cad program, so I used Photoshop with the following ratio: 10 pixels per Inch. The Aqua square is the floorprint of my Fishtank, 480 pixels by 180 pixels The grey circles are 156 pixels wide, which is what the flood would be with 40 degree Optics at 22 inches off the substrate.

Which light pattern do you suggest?

5 LED:


6LED:


7 LED:


8 LED:


Anyone have any advice so far?

If this goes right, I could have an LED fixture in place for about 100 bucks!
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Old 05-09-2012, 01:44 PM   #3
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Wish I could rename this thread to DIY LED fixture... Mods?

Maybe someone would reply then, lol.
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Old 05-15-2012, 04:54 PM   #4
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Alright - Took the plunge and ordered 140 bucks worth of stuff from rapidled.com

They were SUPER helpful and answered all 3 of my e-mails within minutes.

I have on order:

12x Cree XP-G Cool White LED's With 80 Degree Optics Pre-installed

15 Feet Wire

Meanwell Dimmable 24-48 volt Driver

Thermal adhiesive

10 Volt Power Supply

Dimmer Switch (Pots)

... Think that's it, lol.

Ran me 140 bucks with shipping.
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Old 05-15-2012, 05:11 PM   #5
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Wish I could rename this thread to DIY LED fixture... Mods?

Maybe someone would reply then, lol.
Ask and you shall receive.
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Old 05-15-2012, 06:11 PM   #6
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I will be following this thread! I really hope the LEDs will work for you. I have been wanting to build something like this for a long time, I just don't have the motivation.
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Old 05-16-2012, 11:27 AM   #7
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I am beyond excited! I managed to pitch the expense to the fiancee, beacuse we're looking for houses, and will have to pay our own electricity bill.
I guestimated the power numbers and showed her how it would pay itself off in about a year in power and lightbulb replacements.

Just got my tracking number from USPS. Excitement!

Here's my order details:


10K Ohm Linear Potentiometer
$3.50 USD


10V AC Adapter
$10.00 USD


Arctic Alumina Thermal Adhesive
$7.00 USD

Bulk Wire (White) (15 feet)
$3.75 USD


CREE XP-G R5 Cool White LED with 40, 60, or 80 degreeLens
(Lens Color: Black, Lens Width: 80 Degree) 12 Pack
$66.00 USD

Mean Well ELN-60-48D dimmable driver
$34.00 USD

Subtotal:
$124.25 USD

Shipping:
$15.00 USD


Grand Total:
$139.25 USD
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Old 05-16-2012, 03:05 PM   #8
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Yeah!! I have i led fixture too and although i didnt soldered anything it will be cool to see how you make the fixture!! Plus i ordered yesterday 5 cree xml cool whites to have some carpet plants too but with some bjb solderless connectors and carclo optics too!! I know you are gonna see the differense!! The leds are the best lights when you compare appealing to how good it looks plus the energy, money, and heat costs!! Good luck my friend i'll be following this post 4 sure!!
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Old 05-16-2012, 04:37 PM   #9
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Thanks! Yeah, I'm starting second guess my decision to do soldering. I've done a LITTLE bit... Like... I fixed the Power supply on my Samsung TV when the capacitors let go... but I'm really afraid of "overheating" the LED's when I solder. Does anyone know if the RapidLED ones are "pre-tinned"?
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Old 05-16-2012, 04:51 PM   #10
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I dont know!! But there many youtube videos abut soldering! Even soldering the leds for aquariums!! So if i were you i'd be looking to some guides of how to make it happen like the youtube vids!!
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