The most common type of grow light for general purpose indoor applications-extremely efficient and capable of producing intense light indoors. Metal Halide (MH) lamps give off a bluish spectrum, perfect for vegetative growth.
The 2014 average base salary is $43,576 - 57.4% of total compensation. The remaining components (mandated benefits, insurance, and paid time off) are valued on average at $29,653 or 42.6% of total compensation-an.
Salary is what people pay you to do a job. So, mean annual salary means the average amount someone gets in a year. It also implies data for more than one year, and some fluctuations. Mean = average so the mean annual salary would be the average of everyone that worked in that position. Not everyone is making 50,000 in that position at that career level but the average is 50,000. You might make slightly more or slightly less than the mean average salary.