wiring a 4 bulb ballast into 2 bulbs is pretty straight forward.
a 4 bulb ballast will have 8 wires coming off it, usually the color codes are standard, a black wire is your mains hot, a white wire is your mains neutral, a pair of yellow wires are your ballast neutrals, a pair of red and a pair of blue are your four hot bulb-leads
so you hook the black and white up to the power (don't forget the ground wire either, it usually just screws onto the ballast).
combine the pairs of red and blue, so each two wires goes to a single socket.
then each yellow wire goes to the opposite socket.
a note on overdriving sockets ... a socket has two "poles", which normally are left separate for magnetic ballasts, but for electronic overdriving, you want to short those poles together, so you need a wire that jumpers from one pole to the next on each socket. ??Does that make sense?? Let me know if you need some pics, I think I got a modified shoplight laying around.
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bummer about availability in canada... all I can offer is keep searching! if all else fails, shop around online for a fulham workhorse 5 or 7 - they cost more than the ballasts at home depot, but also offer more power.