I have Lumatek, and I have had to have it replaced once. I must say that everything will break at some point, but what matters is how the company responds to such an incident. I took mine right down to the hydro shop and they gave me a new one. It sold me on them. I have never ever had such an easy time getting a company to replace a damaged or defective item. I believe they have a 3 year replacement on them.
As far as bulbs the Agromax has 95,000 lumens just like the Hortilux, but it only costs around $50. So I have been using the Agromax.