Zoo Med Laboratories AZMHLG15 15-Watt Highlights Incandescent Bulb, Green Zoo Med Laboratories Highlights Incandescent Bulb Zoo Meds Highlights Incandescent Aquarium Bulbs are a new addition to our aquatic line of products The bulbs are gel coated with color, rather than paint, so the color will not chip or wear off. Zoo Med Laboratories Highlights Incandescent Bulb Zoo Meds Highlights Incandescent Aquarium Bulbs are a new addition to our aquatic line of products The bulbs are gel coated with color, rather than paint, so the color will not chip or wear off The bulbs are gel coated with color, rather than paint, so the color will not chip or wear off