Silva Vinh. lighting. January 23rd , 2017.
Freshwater aquarium lighting is often a matter of confusion for beginners in the hobby of fish keeping. This is because there are so many types of freshwater aquarium lighting to choose from. People either end up choosing anything that is available or something that they do not need for the type of aquarium they plan to use. In reality, the choice of lighting depends on what you plan to do with your aquarium, which is why it is also necessary to make the right selection for your aquariums lighting. Aquarium lighting that comes with aquarium kits is usually sufficient for your fish.
Make a simple two-dimensional "flat" pattern the size of the shade out of paper or cardboard. For example, use the lower edge of the cardboard for the base line. Be careful to get measurements up the height of the shade. Then draw a horizontal line parallel to the base line. This represents the top edge of the lampshade.
Local building control authorities determine the amount of time that a ceiling can hold back the fire, thus the term fire-rated ceilings. Typical fire rating for a ceiling is an hour and the best ones can last up to two hours. Cutting a hole in a ceiling to fit downlights will compromise the ceilings fire rating. Because downlights are not designed to fit seamlessly into a ceiling, the gaps formed within the light fitting will now be the ceilings weakest point where flames and smoke can pour through and spread the fire to the floor above. Ideally, each luminaire in a downlight fitting should be fitted with a fire protection cover which prevents both flames and heat being transmitted through the luminair up into a ceiling gap.
(53) Dorman BH, Sade RM, Burnette JS, et al. Magnesium supplementation in the prevention of arrhythmias in pediatric patients undergoing surgery for congenital heart defects. Am Heart J 2000; 139: 5228.[Medline]
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