power usage of light

[sandaz]

Does anyone know the power usage in $/per hour of a 400W and 600W light, sontiagro. Cheers

[Frazz]

The way ive worked it out is 600w x 12hrs= 7.2 kilowatt hrs , 7.2 k/h x whatever your electricity company charges per k/h e.g. 7.2 x 20cents= $1.44

this just example you change the figures to suit your situation

 

I think? :scratchin

[dsyfer]

How much does a kilowatt cost you?

 

Here in SA it is roughly 17cents

 

which would mean

 

400watt = 6.8cents per hour

600watt = 10.2 cents per hour

 

 

 

edit: Frazzle = snap :

Edited September 17, 2005 by dsyfer

[merlin2004]

Here's a good link for lighting costs with a calculator

 

http://www.hydroponics.net/learn/hid_lamp_op_cost.asp

 

:thumbsup

[Frazz]

Thanks for that merlin, didnt realise the halides were so inefficient along side sodium

[Luke Skywalker]

Yeah, lumen for watt comparisons show halides to be less efficient, but plants don't see lumens, they see PAR (Photosynthetic Active Radiation) Watts. So it may be that particular halides may work out to have more available watts of PAR than some lesser HPS units. But generally, yeah, HPS is more efficient, but a mixture of HPS and MH will always outdo one or the other.

 

It's all about spectrum.

 

As for costs, in WA a 400w costs about 91.2c per 18hr day, and 60.8 cents per 12 hr day. A 600w costs about $1.36 per 18hr day, and 91.2 cents per 12 hr day. Whilst a 1000w costs about 2.28 per 18hr day, and 1.52 per 12 hr day.

 

Remember that depending on the manufacturer, a 400w lamp actually uses an initial start up of between 672 and 720 watts to ignite the lamp, dropping to between 432 and 528 watts when running, So remember that the wattage of the lamp isn't the actual amout of electricity, you need to use Ohm's law (Amps x volts = watts) to work out how much the lamp and the ballast are using.

[Frazz]

Well thanks for your elaboration Luke, what i like about your posts is that after reading them i have nothing more to ask..i know it all :thumbsup

 

I have a sneaking suspicion you do come from another galaxy.

[cranky]

Here in NSW a grow box witrh fan and 400w hps costs about $40 a month to run. 18/6

My missus worked it out from elect . bill and yes she makes me pay for it

Edited October 5, 2005 by cranky

[Luke Skywalker]

As she should... heh heh

 

Thanks for the compliment there Frazzle, I try and keep things concise, but somehow it always ends up being long winded.... Just hoping to help though.

[Doob]

goooo luke