mh vs HPS

beenthere donethat said:

Ok..we got that coffee mess all cleaned up. It was really easy because we had so much light from these massive CFL's we use here...

and if we're getting down to tossin shit, suckin E...it would be far better to READ than to ask stoopid little noob questions that have been answered a 100,000 times before here in a million other threads generated by 12 year olds on the very same topic....

kids...they think they know everything...

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Must be hallucinating, I never claimed that I knew everything. I asked a question that was part of a thread that was inquiring about the use of lights. I was politely trying to understand the logic or lack there of. You interjected with you snide comments about someone else that isn't here to defend themselves or their claims. Oh well...easy way out...just the same as it was for you to post that and roll out right after before I could reply. Anyways opinions are not the gospel. I take what Video says as what they are "opinions". Dont' get mad cause I question the "opinions". As for the name calling. If anyones intelligence or maturity was graded here. I would say I win this contest. I didn't need to use name calling like "suckin e" "stoopid" (btw you spelled it wrong), noob. Mine was a little more clever. Keep trying

I need a HERO!

Its amazing, you calling the kettle black.
I did read the post, have you?
The reply was to hearmenow, where he clearly stated that a 400 was good for a 5x5 area, before you reply, do your homework.

"hearmenow
For $200 (S&H included) you get a 400 MH for vegging and a 400 HPS for flowering. That's what I am planning on getting. More than enough for a 5'X5' area. Ideally, I'd invest in a digital ballast and an air cooled light but now you are talking about $400 and for this amateur grower, that's just too much. If I were growing to sell, I'd easily invest $2k. You'll make that back on your first harvest alone. Good luck.?"

nongreenthumb said:

its a shame you dont even bother to read other peoples posts properly before putting down your opinion on it.

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SmokerE, I hope you have the info that you need, my point was that in a 3x3 area, using a 400 watt light, your at about 45 watts per sq ft.
Peace dude.

videoman40 said:

Its amazing, you calling the kettle black.
I did read the post, have you?
The reply was to hearmenow, where he clearly stated that a 400 was good for a 5x5 area, before you reply, do your homework.

"hearmenow
For $200 (S&H included) you get a 400 MH for vegging and a 400 HPS for flowering. That's what I am planning on getting. More than enough for a 5'X5' area. Ideally, I'd invest in a digital ballast and an air cooled light but now you are talking about $400 and for this amateur grower, that's just too much. If I were growing to sell, I'd easily invest $2k. You'll make that back on your first harvest alone. Good luck.?"



SmokerE, I hope you have the info that you need, my point was that in a 3x3 area, using a 400 watt light, your at about 45 watts per sq ft.
Peace dude.

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I call scum whatever I feel like

videoman40 said:

Its amazing, you calling the kettle black.
I did read the post, have you?
The reply was to hearmenow, where he clearly stated that a 400 was good for a 5x5 area, before you reply, do your homework.

"hearmenow
For $200 (S&H included) you get a 400 MH for vegging and a 400 HPS for flowering. That's what I am planning on getting. More than enough for a 5'X5' area. Ideally, I'd invest in a digital ballast and an air cooled light but now you are talking about $400 and for this amateur grower, that's just too much. If I were growing to sell, I'd easily invest $2k. You'll make that back on your first harvest alone. Good luck.?"



SmokerE, I hope you have the info that you need, my point was that in a 3x3 area, using a 400 watt light, your at about 45 watts per sq ft.
Peace dude.

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I did my homework....i looked for a post from someone that knew something about lights. Not someone who knows how to use them for plant torture.

SmokerE said:

Wouldn't he reduce his square foot if the bulb was placed 1 foot above the canopy?

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Yes he would, and it's one of the biggest weaknesses of cool tubes. People rave on about cool tubes and how close you can get them to the plant tops, what they forget is that the tiny internal or external reflector simply cannot and does not spread the light out very effectively over a wider area used at 1 foot above the plant tops. Even if attached to a more efficient reflector, cool tubes still disperse light poorly - and the primary reason is because people use them so close to the plant tops.

The lower a light is used to the plant canopy top, the maximum amount of light depth penetration you get but also the less lateral width and length of light dispersion you get. This is why lights used close to the plant tops cannot cover as big or wide areas as more powerful lights used at higher distances.

[/QUOTE]Your factoring it by the plants being 5 foot tall, I doubt they will be that tall. [/QUOTE]

Plant height has no bearing on lateral light dispersal, only depth penetration.

Ok kids, settle down. Sorry my post instigated all of this. Let me clarify my statement. Remember, I am small time and growing for the Mrs and me. I plan on devoting a maximum area of 5'X5' for vegging. My thought is that until I indentify a female mom, I will need between 4-6 plants - I estimate 5'X5', although I probably can get by with less space for 4-6 plants. Once I have a mom, I plan on only flowering a max of 3 plants at a time. Remember, I am only growing for our own supply - 2 plants, yielding anywhere from 4-6 oz/month would be enough for us. So, I will veg 4-6 plants initially, then flower 2 or 3. 400w would be enough for me.

Plant height has no bearing on lateral light dispersal, only depth penetration.

I understood that part.

3 plants....400 watt hps...your str8

videoman40 said:

Its amazing, you calling the kettle black.
I did read the post, have you?
The reply was to hearmenow, where he clearly stated that a 400 was good for a 5x5 area, before you reply, do your homework.

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videoman40 said:

The bulb SHOULD be 1 foot above the canopy, the math has nothing to do with plant height.
3x3 is the proper coverage for a 400 watt light, the "5x5" is the size room that was previously suggested, not plant height.

Babygro has never even used an hps light.
Peace

Quote:
Originally Posted by SmokerE
Wouldn't he reduce his square foot if the bulb was placed 1 foot above the canopy? Your factoring it by the plants being 5 foot tall, I doubt they will be that tall.


Babygro has a hell of an explanation on here somewhere.

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Now forgive me if i am wrong how was this thread being directed at hearmenow with a quote from smokere, it looks like your speaking to smokere to me.

So either your dumb or a liar, I know about your previous infractions so I guess I am going to go with both.

In fact, I found a "club" for growers devoted to 250W HPS where the yeilds were impressive. All were personal use growers and they had me convinced that 250W would be all I would need. Howver, after researching the costs, I didn't see the huge price difference, so I've decided to spend the extra bucks and get the bigger light.

Babygro....how many lumens do you need during veg? Would a 400 watt MH cover this?

One more thing....why would you talk in watts when he was talking about MH and HPS. The amount of lumens per watt is different for each bulb. Lumens would be the ultimate factor not watts.

SmkerE was asking about the statement, make by hearmenow.
your a funny dude.
Peace

Now forgive me if i am wrong how was this thread being directed at hearmenow with a quote from smokere, it looks like your speaking to smokere to me.

So either your dumb or a liar, I know about your previous infractions so I guess I am going to go with both.


I laughed.

hearmenow said:

....... Once I have a mom, I plan on only flowering a max of 3 plants at a time. Remember, I am only growing for our own supply - 2 plants, yielding anywhere from 4-6 oz/month would be enough for us. So, I will veg 4-6 plants initially, then flower 2 or 3. 400w would be enough for me.

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Thats what Im shooting for too. No female yet so I have 6 plants in different stages of veg until I get a solid female to clone. Anyway...growing for the lady and myself.

Pretty much the same light...400wHPS for veg/flower. Hoping to get about 6oz. per month...hoping to get that outta 3-6 plants.....thats enough for my personal. Keep us posted.

SmokerE said:

One more thing....why would you talk in watts when he was talking about MH and HPS. The amount of lumens per watt is different for each bulb. Lumens would be the ultimate factor not watts.

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Thats a very good point, this is why i never base what light you need on how many watts per sq foot.

Every bulb out there runs differently, the efficiency of the bulb can vary widely, its better to go off lumens this way your not going to have to work out your bulb effiency and the distribution of light before you can really figure out how many watts per square foot you really need

SmokerE said:

I am referring to lumens...not wattage per foot.

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A 400w HPS outputs 55,000 lumens at 1 foot distance on 1 square foot. At 2 feet it outputs 13,750 lumens, at 3 feet it outputs 55,000/9 = 5,555 lumens. At 4 feet it's covering 55,000/25 = 2,200 lumens.

So at 3 feet distance it's covering a 9 sq foot area, which is also 3 x 3 with 5,555 lumens per square foot.

So for vegetative growth (which only needs about 2,500 - 3,000 lumens per sq foot) a HPS light will work perfectly well at about 3 1/2 - 4 feet widths, so would cover a 4 x 4 area with 2,200 lumens per square foot or 3 1/2 feet at 4,489 lumens per sq foot.

For flowering the area will narrow if you want to get the optimum light to your plants, which is reckoned at about 8-10,000 lumens per sq foot. We know 2 feet puts out 13,750 and 3 feet 5,555, so 2 1/2 feet would give 8,800 lumens per square foot. So for flowering you should be looking at an area of about 2 1/2 feet square for optimum light per square foot.

A 400w isn't a particularly efferctive lamp in terms of lumens per watt, where 600's offer a much better option and cover a much wider area.

Damnit...I need to get a sledge hammer and 2x4's and some plywood. My growroom is 7 ft by 3 ft. with a 400 watt hps...i ain't gonna yield shi*

Blood, I completed my last grow of bag seed with a combo natural sunlight, supplemented with CFLs and I harvested 2 plants yielding approx 7.5 oz wet. So I am guessing I'll end up with close to about 2 oz. Not too shabby considering during the first month of veg, I had no clue what I was doing and the plants endured a lot of stress. I think 4-6 oz dry a month is easily doable.