Hmmm, "50VAC output"
If you meant DC, I could sure use a few if the price is right.
Please give us a "heads-up" when you e-bay them.
You are right, Weezard, it was a typo. Its 50VDC output actually.

So they work directly from mains AC and power up an array up to 50VDC. 82% efficiency slightly below half load, close to 90% when near full load. Ive done more efficient drivers myself, but those are very versatile, due the wide range of operation both on voltage (6-50VDC) and on current (100-900mA). They are CE certified. Current adjustment is done with a screwdriver.

I dont know the price yet, but they are way cheaper than any similar driver ive ever found. When i pay duties and taxes ill know accurately how much they cost, but i believe i will be able to sell them below 30$ each.

The reason to order 400Kg is its the minimum order requeriment Ive been able to find for extruded aluminum. But as its been hard to find LED heatsinks large enough to build illumination arrays, i think i wont have problems selling the excess. Ill get them on 6m bars, so ill cut them at any desired length (they are 13.4cm wide and 2cm deep with 15 dissipating fins).