Gardener, the Lumatek bulb is absolutely fine. Asking what bulb to go with is sorta like asking which hair color on a girl is hotter. Everyone has their own opinions. I have used Hortilux as well as Ushio, both high $$$ bulbs. I will say if you have a digital ballast, I would shy away from Hortilux as they are very well documented to have serious problems with some manufacturers. Lumatek being one of them. Thus the reason I went to Ushio. I run Lumatek digi and Hortilux would not warranty their bulb because of it. It plainly states that on their website, I just failed to read it.
Long story short, the Lumatek bulb you linked to will work perfectly fine for you. Are some bulbs better than others? Of course. Will it make a major difference? Nope.