Loy means to float and a krathong is a lotus shaped vessel made of banana leaves. The krathong is made of banana leaves, a candle, three joss sticks, and flower decorations.
By moonlight, people light the candles and joss sticks, make a prayer and launch their krathongs in canals, rivers or small ponds
LOY KRATHONG FESTIVAL - THAILAND
http://goodstuff4u.multiply.com/journal/item/78/
Loy Krathong Stuff
http://goodstuffsworld.blogspot.com/2013/11/loy-krathong-stuff.html