Glad that that's cleared up!
I hear you about the DC supply; I got lucky with my HP supply; max 36 volts, max 5 amps (~180 Watts), for ~$40 plus shipping (+~20).
In your case, as long as you understand that using AC means that you could have some variations on the power output, I guess it'll have to do, but I wouldn't go that way. I'd guess at a variation of at least +/- 5 %, from one day to the next, and I think I'm being optimistic.
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