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Discussion Starter · #1 ·
My pico tank (MacQuarium) uses a 9W compact fluoro for lighting; the ballast and socket were lifted intact from a cheap $20 desk lamp. It uses a 2 pin type tube, what I believe is known as a G23 base (don't quote me on that).

Last week I finally found a source of proper aquarium-spectrum tubes in this 9W size so I eagerly bought a couple... they arrived today and just to rain on my parade...



... these have 4 pins - what the box states is a 2G7 base.

I'm reasonably savvy with electronics but I have to admit, I have no idea what the pins connect to or how they should be wired. My question is: assuming I can get a suitable socket, is it possible to wire up the existing 2 wire ballast to run these 4 pin tubes? Or do i need a different ballast?

Cheers, Ben.
 

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I'm 99% sure that you'll be able to use the same ballast with the new bulbs you bought...but buying the end caps + shipping might be more expensive than just buying the correct bulbs.

The bulb you want *might* be this one:

http://www.hellolights.com/index.asp?PageAction=VIEWPROD&ProdID=436

BUT...this is what it says.

* GX23 style base (hellolight's ballast kits have GX23 bases on them). Note, most 9W fixtures have G23 bases, NOT GX23. This bulb may not work on your 9W unit. Please make sure your sockets are GX23, if you are not sure, please call us and we'll help you out.
 

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Discussion Starter · #3 ·
Hi epicfish, thanks for the links. i've found a lighting specialist here in Australia that sells the various bits and pieces and am waiting for them to get back to me regarding the socket cost and hopefully a wiring diagram or firm answer on the 2 pin to 4 pin compatibility. i have a sneaking suspicion that the 4 pins are just 2x the 2 pins, maybe one pair for each side of the tube loop.

for interest's sake, i found a pic of same ballast i have -> http://gmtlighting.com.au/enlarge.php?id=EC9. from what I can gather, they're pretty standard in the low wattage end. i'm yet to find a special ballast for 4 pin G27s so, here's hoping ;-).
 

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Check this link for fulham ballasts. just cross reference a similar bulb to yours and you can see the wire diagram. I would use the quad bulb at 1x 10 watts.

http://www.fulham.com/Find_Process.php

Cheers, Whitepine
 
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