T5 high output on eBay
I got a recommendation from the orchid forum about an eBay seller. I bought a four tube high-output T5 light and so far I am very pleased with it. The price was reasonable - around half of what the fancy grow light stores are charging. The quality seems good and the seller appears to understand his line of business. His name is:
with the exclamation mark, if anyone is interested. (It used to be "dinosore777" but he appears to have just changed it.) He also has lots of other grow light systems for sale.