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The eternal light question


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  #1  
Old 07-22-2010, 12:48 PM
Troy A-Z Troy A-Z is offline
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Default The eternal light question

Does any one out there have any data on the costs (approx) it tkes to run each type of grow light.

Example. How much does it cost (again approx.) to run the different strengths of MH, compared to hps, compared to CF, and so on?

I would like to gather the data on these to put out there since it seems to be the common question that a lot of new comers, including myself, have but have never really found an answer for.

The cost of running lights can be a HUGE factor in setting up a grow system and it to have the data telling what it costs to use each type of light could save a person a lot of money if they are on a budget. To buy an expensive light system and finding out that you cannot afford to run it is many steps back verse having to use a lower light and dealing with the slight drop in over all plant productivity.

Again, I am just a new comer looking for answers.

Thanks in advance for any info. provided.

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Old 07-22-2010, 08:49 PM
GpsFrontier GpsFrontier is offline
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This is a good question, I was wondering the same thing about a year ago. Although I grow in natural light, so it isn't an issue for me right now. I will try to look for that type of info later tonight if I can. I think one of the big reasons it is not readily available is because electricity costs vary so much from one area to another, and even sometimes with the season like summers when everyone is running their AC. I can tell you how to figure out the exact cost of the lighting once you have it running, but it needs to be plunged in first.

I could be wrong but as I understand it, MH and hps are the most expensive to run. Then I would guess that florescent would be next, and lastly led would likely be the cheapest to run. There are also other considerations to consider like heat buildup with MH and HPS, and the electricity needed to run fans to get rid of it. Also the the fact that florescent cant put out the same type of intensity (needing more to do the same job). LED may be the cheapest to run but not to buy that I know of. They all have there pro's and con's. Is it possible to grow in natural light?
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Old 07-23-2010, 11:21 AM
Troy A-Z Troy A-Z is offline
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Thanks GPS,
Even what you have stated is a good start to answering some of the questions that are out there with out having to weed through multiple sources.

I totally understand in some instances it is comparing apple to oranges, some lights give off heat and need fans others are cooler but not as intense, etc.
But again those are things that people have to mull through a lot of info to gather and having them in one place is helpful.

Unfortunately, growing year round in natural light is not an option for me. I live in Wisconsin and the amount of light wanes in the winter not to mention I am gong to try this Aquaponically and have yet to develope a taste for fish popsicles.
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Old 07-24-2010, 11:04 AM
willard3 willard3 is offline
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All you have to do is visit a lamp manufacturer's site, find the # of lumens for a lamp and divide by the number of watts....it's already tabulated, no reason to reinvent the wheel.

Product catalogue
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Old 07-25-2010, 02:53 AM
GpsFrontier GpsFrontier is offline
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I think the person was looking for a cost comparison chart, not really wanting to make there own. I don't know if dividing the lumens by the wattage will give you an accurate power consumption. But let say to make the math easy, you have a florescent light that puts out 10,000 lumens at 100 watts. 10,000 divided by 100= 100. Is that 100 kilowatts? Is that per minute, per hour? Also how would you figure out the energy consumption for appliances that don't put out light (lumens)?

It needs to be broken down into kilowatt hours in order to be able to figure out the cost per hour to run. Then the actual kilowatt hours can be multiplied by the cost per kilowatt hr on the electric bill.

I don't know how accurate it is but this link may help.
APPLIANCE COST CALCULATOR

As I mentioned once you have it plugged in, you can use a KILL A WATT meter like the P3 Kill A Watt meter to tell exactly what it costs, as well as monitor cost and usage (of any electric device/appliance). The Kill A Watt meters come in all shapes and kinds, with many different options, and for as little as $18 and up. Most home improvement stores carry them.

P3 Kill A Watt Electricity Load Meter and Monitor
Kill A Watt P4320 Electricity Usage Monitoring Surge Strip
P3 International P4480 Kill A Watt Electricity Usage Monitor with Electronic Graphic Timer
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Last edited by GpsFrontier; 07-25-2010 at 03:58 AM.
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  #6  
Old 08-06-2010, 10:17 AM
willard3 willard3 is offline
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Quote:
Originally Posted by GpsFrontier View Post
. But let say to make the math easy, you have a florescent light that puts out 10,000 lumens at 100 watts. 10,000 divided by 100= 100. Is that 100 kilowatts? Is that per minute, per hour? Also how would you figure out the energy consumption for appliances that don't put out light (lumens)?
If you divide lumens by watts, how would you come out with kilowatts?
Watts/1000 = kilowatts
(Lamp watts/1000) X hours of operation = kilowatt hours
KWH X cost/kwh = cost
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Old 10-29-2010, 11:22 AM
willard3 willard3 is offline
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Quote:
Originally Posted by Troy A-Z View Post
Does any one out there have any data on the costs (approx) it tkes to run each type of grow light.

Example. How much does it cost (again approx.) to run the different strengths of MH, compared to HPS, compared to CF, and so on?

Thanks in advance for any info. provided.

Seems like a lighting question to me.............

Watts and lumens are both measures of energy, even if you don't know it.
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Old 10-29-2010, 12:06 PM
NorEastFla NorEastFla is offline
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Oh my goodness, the original question has seemed to have gotten lost in a massive amount of extra information.

Let me jump into the fray..hehe

Ok, lighting costs are easily calculated and I can tell you how to do it with no pain or strain.

First, let me say that what you pay for is "Watts Used Per Month".

When you have used One Thousand Watts for One Hour, you have used exactly One Kilowatt.

So, if you use 250 watts for 4 hours, you have; 4 times 250 watts equals 1000 watts used in 4 hours. So, you have used One Kilowatt in 4 hours.

If you look either on your account with your electric company or on your bill, you'll see how many Kilowatts you used for the entire month.

You'll also see how much you paid for using them as your final total bill.

Yes, I know that includes 900 taxes and fees. I don't care. You paid for it anyway.

If you divide your total bill by the amount of kilowatts you used for the month, you'll see how much each kilowatt cost you, including all the fees and such. I do this every month and it comes out to within a dollar or two of what my bill is.

Like last month:

Total Bill: 203.94

Kilowatts Used: 1994

Now: 203.94 divided by 1994 = 0.102

That means I paid 10.2 cents per/kilowatt that I used, overall.

I read my meter and do this equation every month. It's always within a dollar or two.

I see how much I used and do the math. Then I know how much my bill will be.

So, that said, a watt is a watt is a watt is a watt. One watt costs exactly what one watt costs. It makes absolutely no difference what used the watt.

Now we're at the root of the answer:

If you are using a 400 watt light, and it is really using 400 watts, then for every hour you have it on, it will consume 400 watts. If you have it on 24 hours a day, it will use 9600 watts, or 9.6 kilowatts.

If you pay 10.2 cents per/kilowatt like I do, then that light will have cost you 98 cents for each day you ran it for 24 hours.

See how easy that is?

Now, here's the proverbial monkey wrench in the works...

But, but, but....MY 400 watt HPS bulb says it will put out 430 watts of light!

Ok, here's the only REAL answer to that.

I own a small meter called a "Kill-A-Watt" meter ($25). I plug it into an outlet, then plug a device into the meter. I then set it to record how many watts are being used.

I leave it on like that for exactly 24 hours to the very second.

It shows me on it's readout, EXACTLY how many watts that device used in that 24 hour period of time.

NOW I know how many watts that light REALLY uses.

From that point, it's as easy as I've shown above to figure out almost exactly how much your light will cost you each month by just doing the math.

No problemo!
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Last edited by NorEastFla; 10-29-2010 at 02:17 PM.
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Old 10-29-2010, 07:27 PM
GpsFrontier GpsFrontier is offline
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willard3
Lights are not the only things that use electricity, energy and electricity are not the same thing (even if you want to think so). The electric company does not consider or charge by lumens. If they did then they would not be able to charge anything for running your refrigerator all the day, except when you open the door and the little light goes on. But then all you would need to do is take out the bulb and all that electricity would be free. The electric company (that charges you for the electricity) does not care if it's a light or not, they charge the same regardless. You just cant get past the word "light" to see the picture.

NorEastFla
I agree everything you've said. I had thought about using the wattage of the light bulb itself, but just didn't know if that would be real accurate. Like you mentioned the actual wattage may very. Also I know the ballasts used by some lights must draw wattage/electricity. I too recommended using the Kill-A-Watt meter, I even left several links to some in my second post in this thread as a bit of info for anyone it may help. Although the original poster of this thread was hoping to be able to compare costs before buying the lights, so I'm not sure if it helped him with the exact question. But I agree they are very useful.


P.S. I noticed that you never mentioned "lumens" in the entire post. hehe.
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Last edited by GpsFrontier; 10-29-2010 at 07:33 PM.
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Old 10-29-2010, 08:32 PM
NorEastFla NorEastFla is offline
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Quote:
Originally Posted by GpsFrontier View Post
I agree everything you've said. I had thought about using the wattage of the light bulb itself, but just didn't know if that would be real accurate. Like you mentioned the actual wattage may very. Also I know the ballasts used by some lights must draw wattage/electricity. I too recommended using the Kill-A-Watt meter, I even left several links to some in my second post in this thread as a bit of info for anyone it may help. Although the original poster of this thread was hoping to be able to compare costs before buying the lights, so I'm not sure if it helped him with the exact question. But I agree they are very useful.
You're right about the ballasts also costing money. It's a rule of thumb in the power world that any device that creates heat also uses electricity. Even a wire that is nothing but an extension cord will cause a very small increase in total wattage used by the device it's connected to.

I have used that Kill-A-Watt Meter so many times on the various devices in my home that it's paid for itself in nothing more than my own piece of mind.

You can even figure out exactly what toasting a slice of bread costs with it...hahaha

Lumens become important only when calculating *how much* light is needed and/or given to a plant. The medicinal marijuana growers in many states now find it necessary to calculate maximum lumens for optimum growth of their medication. I know an elderly lady who uses it for her arthritis and swears it helps her more than anything she's ever used. The growers of those plants really get into how much of this and that they use.

If I were growing exotic plants in an indoor, regulated environment type grow, then I would need to know precisely how many lumens per/square foot of plant canopy I was using, so that my plant growth would be maximized for the periodic plant sales.

Lumens, however, have nothing to do with power consumption really. They have more to do with plant growth and the ability to *see* in the various spectrum.

Photons being the physical part of light, wattage being the power side, spectrum being the type and lumens being the amount of photons of each spectrum.

Whew! That was a mouthful! hahaha
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Old 10-30-2010, 02:08 AM
GpsFrontier GpsFrontier is offline
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NorEastFla
Again I agree 100% with what your saying. I was taught in school that anything that causes resistance (ohms) generates heat and uses electricity. Like you mentioned even a extension cord has resistance and is a factor in power consumption. I don't claim know everything, but that doesn't mean that I just believe anything that anyone says either. If it doesn't make sense to me, I ask questions (sorry if that offends you willard3).

I have known about the Kill-A-Watt Meters for about two years now. I saw one on a show about being green, and decided to look into them. I still have not gotten one, but would like one because I would like to know just how much each appliance in the house is costing to run. I grow everything outside so hydroponic lighting is not an issue for me (at least now), but I may do some indoor growing in the future. I also know they are easy to get, I have seen them down at Home Depot and Lowe's, I just always seem to have something else to spend the money on.

And again what you say about Lumens is very true (I was only being sarcastic in my P.S.). But I agree that Lumens are essential to plant growth and photosynthesis, and even a form of energy in that regard. It's just not as a form of electricity as willard3 would have me believe. But simply just a measurement of preservable light (the key word being "preservable") to the human eye. I also know there are meters that will tell you the Lumens at the distance you place it from the light (I don't have one of those meters either). But for any indoor commercial growing operation that would be a must for cost efficacy.

P.S. When I retire, I plan on getting glaucoma so I can get one of those medical marijuana cards myself. It has been 20 years sense I have partaked. But when I'm sitting on the front porch in a rocking chair, I'm rolling a duby to go with my rum and coke regardless.
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Last edited by GpsFrontier; 10-30-2010 at 04:27 AM.
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