[pwreef]

In this particular example its a 48V 1.25A Meanwell power supply. The biggest reason for using is is that that array needs 36V minimum. If you are building a smaller unit, you can use a old laptop power supply for example that outputs 16-18V. With that you will be good to probably 5 LEDs per driver. Looks like AI is built similar to that. For my larger build I am using a Switching Power Supply 200w, 25V @ 8.3A from Stevesleds. With that one I am using 7 XT-E LEDs per string just fine. You can find many like it on ebay as well. This is pretty much what Ecotech uses. The beauty of these drivers is that they dim to 0 and cost under $5 each.