Overall lighting was dimmer than an 18W bulb should be. Coloration was more yellow than the spectrum indicated. Plants began to "melt." This bulb had the same specs as the previous bulb; the previous bulb was just getting old, and started to dim in patches along its length, so this one was purchased as a replacement. It turned out to be totally different than the one we had. Some of the yellow burned off after a few days, but overall, this bulb was insufficient for the plants in the tank.
Purchased another brand from a different vendor, and all is well.
ProsDelivery of the order was very prompt, and the price was reasonable. I do recommend this vendor--just be sure of what you need to avoid getting an incorrect product.