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Offlinekickin-two-hundo
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HPS LIGHT: 250 watt or 400 watt???
    #419429 - 05/17/10 06:56 PM (14 years, 8 days ago)

Hi, i am ordering a high pressure sodium complete setup complete with ballast, reflector, and the light. I am wondering if i should get the 250 watt or the 400 watt, price difference really doesnt matter to me, what i am looking at is a walk in closet which is about 4 by 6. Would it even make sense to get the 400 watt in this small of a space? and would the 250 watt bulb be enough for my closet space?
i plan on having 4-6 plants in there.

Also around how much would the two lights differ in my electric bill be every month? It costs  me 12 cents per kwh.

Thank you for any input from everbody!


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The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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OfflineTektonic
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419437 - 05/17/10 07:24 PM (14 years, 8 days ago)

400w or 600w for that space/plants imho

as far as power bill goes, alot of things factor into the price jump
for some people a 400w would add $40 and some it would add $100 it really depends


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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419440 - 05/17/10 07:29 PM (14 years, 8 days ago)

depends on what guy


--------------------
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anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419442 - 05/17/10 07:30 PM (14 years, 8 days ago)

that doesnt even make sense dude


--------------------
The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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OfflineDungenessDank
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419449 - 05/17/10 07:39 PM (14 years, 8 days ago)

I do not think a 400 watt light will add that much to a power bill. Maybe like 5-15 a month.

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InvisibleAmnesiac


Registered: 10/13/08
Posts: 102
Loc: Under the sea
Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419459 - 05/17/10 08:22 PM (14 years, 8 days ago)

A 400w light burning 12h a day for 30 days will cost $17.28 if it uses exactly 400w and a kwh cost 12 cents.

I have a Sunlight Supply catalog with power usage tables and according to it a 400w light uses 460w of power and at $.12 per kwh, running 12h a day for 30 days would cost $20.22. According to the catalog a 250w light would use $11.88.

Is the floor of the room 4'x6' or is the room 4' wide and 6' tall? If it's 4' wide and 6' feet deep 2 600w lights would be sufficient. If it is 4' wide and a foot or so deep a 400w would be good if you use a vented hood.

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Invisible13eetleJuice
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Registered: 04/20/08
Posts: 368
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419461 - 05/17/10 08:29 PM (14 years, 8 days ago)

Read this post, stickied in the Grow Room Design forum. On the second page about half way down, captain.koons lays out the formula like so...
https://www.growery.org/forums/showflat.php/Number/50049/fpart/2

wattage*usage=consumption
consumption*rate=cost

for example:
250w * 24hrs = 6kWhr
6kWhr * $0.12 = $0.72 (per day)

$0.72 * 30 days = $21.60 (per month)


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Invisible13eetleJuice
The ghost with the most
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Registered: 04/20/08
Posts: 368
Loc: 6' under fertalizing bud
Re: HPS LIGHT: 250 watt or 400 watt??? [Re: 13eetleJuice]
    #419462 - 05/17/10 08:35 PM (14 years, 8 days ago)

Also, I forgot to mention, though it probably goes without saying, that one should always remember to consider the wattage of fans and cooling devices because their usage goes up as well when increasing the wattage of the light itself.


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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: 13eetleJuice]
    #419463 - 05/17/10 08:44 PM (14 years, 8 days ago)

Wow thank you guys alot for the exact numbers, i wasn't expecting that and that was quick too! Okay the closet is huge its a walk in closet. I would say its dimensions are about 4 feet wide, 5 or 6 feet deep and its about 8 feet high. Its a walk in closet. i am not planning on completely filling the closet simply for security reasons.

Another questions, are there big differences in the amount of heat created by the different size lights? and would i have problems keeping the heat down if the closet is sealed up, i will have fans in but will i need an exhaust out of the room?


--------------------
The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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OfflineTektonic
dont panic, it's organic

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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419464 - 05/17/10 08:46 PM (14 years, 8 days ago)

you don't wanna grow in a sealed environment
you want to exchange the air in the room every 5-10 minutes atleast

the heat goes up as much as the wattage


--------------------
Legal & Compliant with local & state regulations.

Daily Tzolkin

:peace: :heart: :earth:

"If triangles' had a God, he would have 3 sides."

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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: Tektonic]
    #419466 - 05/17/10 08:54 PM (14 years, 8 days ago)

what if i just leave the door open?


--------------------
The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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Invisible13eetleJuice
The ghost with the most
Male


Registered: 04/20/08
Posts: 368
Loc: 6' under fertalizing bud
Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419467 - 05/17/10 09:03 PM (14 years, 8 days ago)

Your plants will thrive best with constant air circulation. One reason is that a plant can only use the CO2 in the air that is in a small area right around the leaf. If the air is stagnant, the plants will have a hard time respirating to their full metabolic potential...  meaning for you, less bud.

You should try to find a small oscillating fan or two to put inside the closet to move the air around.

As for the heat; well it's going to build up and it's got to go somewhere. As Amnesiac said, you may want to research vented hoods.


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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419470 - 05/17/10 09:25 PM (14 years, 8 days ago)

Okay update the closet is 5x5x8high. Would a 250 watt be sufficient to grow in there? or do i have to go with the 400? My only concern at all is the electric bill, because it was recently 450 a month and ive been doing all i can to lower it, so im looking at things like okay how much is the electric going to be for the light PLUS how much more will i have to run the A/C because of the light, things like that. Times are hard, all my money is going towards the light and my hydroponics setup. But THANK YOU though beetlejuice you are GREAT!!!


--------------------
The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419471 - 05/17/10 09:34 PM (14 years, 8 days ago)

Okay i am ordering my light from HTG Supply, any word on them good or bad?
Also how much would of those vented hoods run me?
And another question how difficult would it be to provide circulation, i mean am i going to have to put holes in the wall or ceiling, or will the oscillating fans be enough?


--------------------
The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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InvisibleAmnesiac


Registered: 10/13/08
Posts: 102
Loc: Under the sea
Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419472 - 05/17/10 09:37 PM (14 years, 8 days ago)

Leaving the door open will just make the light take a little longer to heat up the space, as it would have the whole room to heat up (or make your ac run constantly). You will need to bring fresh air into your closet from outside through passive intakes and force it out with a fan. If the closet is on the first level of the house I would bring air in from under the house or the basement where it will be naturally cooler then force it out into the attic if it is a single level house or through the nearest wall to outside if not. This will keep you from raising you power bill from having you use your a/c more in the rest of you house because your room would be isolated from the rest of your house.

You would also be better off getting the 400w light for that size room, a 1000w light would be even better because it can light a 4x4 area. But a 400w or 600w would be good to start off with and still leave a little room for expansion.

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InvisibleAmnesiac


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Loc: Under the sea
Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419477 - 05/17/10 09:59 PM (14 years, 8 days ago)

You can get a 600w lumatek ballast bulb and 6" air cooled hood for $330 or a 400w for $250 and then you can get a 6" fan for $90.

I've never ordered from HTG supply so :shrug:

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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: Amnesiac]
    #419482 - 05/17/10 10:12 PM (14 years, 8 days ago)

dam i didnt know it was going to be so much work. There is no such thing as basements in fl soooo where would i bring in air from because all thats under my house is concrete and dirt.


--------------------
The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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OfflineBuddy Guy
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419563 - 05/18/10 12:16 AM (14 years, 8 days ago)

Quote:

cicken200 said:
Hi, i am ordering a high pressure sodium complete setup complete with ballast, reflector, and the light. I am wondering if i should get the 250 watt or the 400 watt, price difference really doesnt matter to me, what i am looking at is a walk in closet which is about 4 by 6. Would it even make sense to get the 400 watt in this small of a space? and would the 250 watt bulb be enough for my closet space?
i plan on having 4-6 plants in there.

Also around how much would the two lights differ in my electric bill be every month? It costs  me 12 cents per kwh.

Thank you for any input from everbody!





Would get em both for a closet that size or two 400 watt lights.
4 by 6 by what?

Calculate your rooms cubic feet by multiplying length by width by height.
Factor in the heat load of your lamps.
Get a fan with enough capacity to move said amount of air as an out take and place it along the top of your grow show.
Get a fan rated at half the amount of cfms as your outtake fan and place it along the bottom as an air intake.

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OfflineTomCollins


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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419618 - 05/18/10 06:42 AM (14 years, 8 days ago)

Quote:

cicken200 said:
Okay i am ordering my light from HTG Supply, any word on them good or bad?
Also how much would of those vented hoods run me?
And another question how difficult would it be to provide circulation, i mean am i going to have to put holes in the wall or ceiling, or will the oscillating fans be enough?




I think they're pretty decent. I haven't encountered any complaints about that site. Depends on which hood you get, but I'd say around 80-150USD.

In regards to air circulation. Unfortunately, getting a vented hood without a dedicated cooling system for the light, is pretty pointless. Unless you get some kind of inline fan that is pulling air through the vented hood, your vented hood is going to do jack shit and that room is going to get hot fast. Remmember that since you'll be using a 400w, your light has to actually be within a certain range of the plants to be effective. Usually this is within 20inches - so unless you have adequate cooling for the light, your plants will really not be happy due to the heat.

An inline fan will cost you around 150-200USD. Though, there are some teks on here that show you how to rig up a stanley blower to do the same exact thing, and I think they're like under 40USD.

--EDIT--

Here is a link to the tek I was talking about: http://www.icmag.com/ic/showthread.php?t=29341

Quote:

cicken200 said:
dam i didnt know it was going to be so much work. There is no such thing as basements in fl soooo where would i bring in air from because all thats under my house is concrete and dirt.




I wouldn't worry a ton about rigging up an intake like that. Passive intake should be fine. Just make sure your exhaust is going out of the grow area.


--------------------
andyistic said:
Ok so let me bring you idiots up to speed.
The admins are tired of this shitfest being made the joke of the weed community on the Internet.

Edited by TomCollins (05/18/10 09:30 AM)

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Offlinekickin-two-hundo
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: TomCollins]
    #419697 - 05/18/10 10:06 AM (14 years, 8 days ago)

Okay so i have to have air circulation no matter what, i understand that now. I have never used HPS lights before,

how much of a temperature rise am i going to be looking at? I mean am i going to walk in my room and its going to be around 100 degrees? or 90 or what? I keep my house at 78 degrees.

Are there any other kinds of lights i should look at, where i will not have as much heating problems, but will produce the same outstanding results as the HPS lights?

I really appreciate all of your input!!

Just in case anybody cares, here is the light and setup that i am looking to order
https://www.htgsupply.com/growlights.asp?categoryID=1&subcategoryID=155&typeID=55
with the metal halide conversion bulb too.


--------------------
The time you enjoy wasting is not wasted time.




anything and everything i post on here is completely fictional and come straight from the deepest depths of the black hole which is my mind.

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OfflineTektonic
dont panic, it's organic

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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419699 - 05/18/10 10:13 AM (14 years, 8 days ago)

no need for the halide, you can veg & flower with HPS if you get a full spectrum bulb

all good lights make high heat, atm, but plants need fresh air too, so hit two birds with one stoner and vent the light


--------------------
Legal & Compliant with local & state regulations.

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OfflineTomCollins


Registered: 10/06/09
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Re: HPS LIGHT: 250 watt or 400 watt??? [Re: kickin-two-hundo]
    #419711 - 05/18/10 10:23 AM (14 years, 8 days ago)

Quote:

cicken200 said:
Okay so i have to have air circulation no matter what, i understand that now. I have never used HPS lights before,

how much of a temperature rise am i going to be looking at? I mean am i going to walk in my room and its going to be around 100 degrees? or 90 or what? I keep my house at 78 degrees.

Are there any other kinds of lights i should look at, where i will not have as much heating problems, but will produce the same outstanding results as the HPS lights?




I mean, this really depends on the size of your room. In my previous grow, I grew in a closet with a 400W:


When I didn't have any cooling for my light, the temperatures would hit around 35C in the closet. About 38C on the top of the plants. The room outside of the closet was around 27, and the room had no heating and it was during winter. It was a fucking cold winter too. So that hopefully gives you an idea.

If you have a large room that's fairly well ventilated, then the ambient room temperature increase should not be significant. However, the tops of your plants will get hot. Like I said, your light has to be within 26inches to your plants according to this chart:


Without sufficient cooling, you're plants will suffer at that proximity to the bulb.

An alternative to HID lighting is using LEDs. Though they are not quite as good as HIDs (yet) I have seen some excellent grows completed with LEDs. 

Quote:

cicken200 said:
I really appreciate all of your input!!

Just in case anybody cares, here is the light and setup that i am looking to order
https://www.htgsupply.com/growlights.asp?categoryID=1&subcategoryID=155&typeID=55
with the metal halide conversion bulb too.




Quote:

Tektonic said:
no need for the halide, you can veg & flower with HPS if you get a full spectrum bulb




Well you can see a plant through an entire grow with any HPS bulb really. However, I don't think that just because it says full spectrum, means it provides adequate blue spectrum light for the plant. I think it's still primarily orange and red spectrum. That said, plants benefit immensely during vegetative growth when exposed to blue and white spectrum light. I have also heard that you will have much better female to male ratios using an MH during vegetative growth and during the initial weeks of flowering. (Link)


--------------------
andyistic said:
Ok so let me bring you idiots up to speed.
The admins are tired of this shitfest being made the joke of the weed community on the Internet.

Edited by TomCollins (05/18/10 10:35 AM)

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