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I also did this same thing with my 20g high. I got 3 26w 6500k Lights into my hood for only $6 and the price of the bulbs ($12 for 4) So I now have 78w over my tank where I had 15w before and it only cost me $18.
 

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(criminalhate) where do you get $12 for 4 -- 6500K light bulbs? Thanks.
I got them from lowes
The brand is Bright Effects Daylight
which is rated at 6500K 26w each
with an output of 1600 Lumens

Here's a link to the same ones but only in singles I got a pack of 4 at my local store
http://www.lowes.com/lowes/lkn?action=productDetail&productId=296883-371-60051&lpage=none
Ok that's the wrong ones I'll keep looking to see if I can find the Daylight bulbs like I bought.
 

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Nice write up!

Just a few comments though. Incandescent fixtures are not suitable for growing plants since they don't produce a lot of light, despite the wattage. Fluorescent and compact fluorescent bulbs put out far more light per watt than incandescent bulbs do and are thus suitable for growing plants.

Also, I was wondering why you wired the bulbs in series? Wouldn't this make the second bulb dimmer? I'm not a hundred percent sure, bur I think lighting is always done in parallel.
I know I am using CF replacement bulbs (screw in type) and I believe the OP is also. Also incandescent are not unsuitable if using the correct bulbs but they are inefficient so you would need twice the amount of incandescent to equal a CF bulb.

I know most wiring for lights should be done in parallel (I did in my hood) but I do not believe they will cause the light to be dimmer but I do know if the one bulb goes out both will go out (look at old fashion/cheap christmas lights).
 
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