A few things you need to take into consideration when lasering on bottles is the area in which the engraving is to be placed, as well as the shape of the bottle. By far the most common are round bottles which require a rotary attachment. The key is to make sure you have enough room on the bottle to do the engraving. There are also flat or nearly flat bottles out there that look amazing and those don't need a rotary attachment to engrave.
When lasering on glass one thing I try to avoid are large "Bold" areas that need to be engraved. You run into this with some logos and you run the risk of the glass becoming flaky. Here at MBJD Laser we try to discourage our customers that want a bold logo with lots of engraving in one spot because many times you can have issues with the outcome and the glass becoming flaky and it takes away from the beauty of the product. Print / Wording is never a problem, because the nature of fonts have fine detail and that look outstanding. In our experience the finer and more intricate the detail the better the laser engraved look.
With our Epilog Zing laser we used a Speed of 30 and Power of 100 on these bottles.