«We can reclaim vast amounts of energy currently wasted inadvertently into the night sky... by using light fixtures that are shielded to reflect light down where it is needed, as well as using the smallest number of lights and lowest wattage bulbs necessary to effectively light an area,» says DSI. (scientificamerican.com)
Or try gradually lowering the wattage of a table lamp bulb over several weeks. (slumbersounds.com)
Considering how close the bulbs are to the water's surface in most tanks, it's best to use lower wattage rather than higher. (petbusiness.com)