Eliminating Light Pollution . ... Low Pressure Sodium . ... Low Pressure Sodium bulbs are the most efficant, use the least energy in producing light and have very low running costs. ... Because of this Low Pressure Sodium lighting is only suitable for places like streetlights, security lighting or floodlighting where colour definition is not important. ... It is very efficant, being second only to Low Pressure Sodium Lights. ... Both the luminaires shown above use high pressure sodium lights. ...

The English word "array" is translated into Swedish as "f lt" which is retranslated into English as "field". We may therefore perhaps use the word field either by mistake or as a suitable name of a specific array. A new feature of Fortran 90 is that you can work directly with a whole array or an array section without explicit (or implicit) DO -loops. ... An array is defined to have a shape given by its number of dimensions (called " rank ") and the extent for each one of these. ...