Guys Need Help With Light

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14 Apr 2012 22:31 #1 by Godzila (Robertas)
Hey guys got a light unit 2xblue moon tubes and 2xmetal halide 150watts.how much electricity could it use i use to get bills for 180-200 this month 513 could the light use that much electricity?i have blue moons on for 12 hrs and metal halides for 6.hrs.so my blue moons comes on 3hrs later melat halides comes on for 6hrs and blue moons stays on when metal halides goes off blue moons stays for another 3hrs.thanks guys

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14 Apr 2012 23:22 #2 by BillG (Bill Gray)
TO calculate the costs accurately, you would need to specify the wattage of the light tubes too.

I did a quick calculation based on 24W tubes and 39W tubes just to give you a ball park figure. You will need to determine the unit cost from your electricity supplier, this is usually stated on the bill.

Assuming 2 x 24W tubes on for 12 hours, 2 x 150W metal halides on for 6 hours, this gives a total of 2.376KWh (units of electricity), at a unit cost of 20c per KWh ex vat, this would give a running cost of 54c per day (based on vat rate of 13% for a service)

Assuming 2 x 39W tubes on for 12 hours, 2 x 150W metal halides on for 6 hours, this gives a total of 2.736KWh (units of electricity), at a unit cost of 20c per KWh ex vat, this would give a running cost of 62c per day (based on vat rate of 13% for a service)

SO its not the lights that are causing the increase in the bill alone. Its possible they have been estimating your usage for some time and have given you a bill based on an actual reading. Its not uncommon for the suppliers to grossly underestimate the usage over the winter.

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