Hps or MH or LED?

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Tim1987

Well-Known Member
GanjaSnake said:
So, is there anyone in here like me who actually uses the heat from the bulbs as a supplemental heat source?

I have a tiny veg cabinet with a 250W MH that stays on 24/7 and when it gets really cold I add a heat mat under the plants to keep them happy.

Of course I live in a fairly cold climate, and my cabinets are located in outbuildings on my property. I like the idea of running LED's but I've got this system dialed in over the past 12yrs or so and I'm scared I'd have to add more heat sources to the mix.
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Youre not alone bro. Me too.
 
HotKarl2

HotKarl2

Well-Known Member
Tim1987 said:
For my cold climate.
Even running hps @ $0.37kw/hr, is still cheaper than led. Just in heating cost alone.
This debate is so subjective.
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I have both, I haven't decided yet whether I will use the HPS again in the dead of winter. It does simplify the heating issue. However I did the math and still think I come out ahead with the leds, for my tent anyways. I won't know for sure until I try next winter. Anyways, led for 6-8 months, HPS for 4-6, win win.
 
Lucky Luke

Lucky Luke

Well-Known Member
HotKarl2 said:
I have both, I haven't decided yet whether I will use the HPS again in the dead of winter. It does simplify the heating issue. However I did the math and still think I come out ahead with the leds, for my tent anyways. I won't know for sure until I try next winter. Anyways, led for 6-8 months, HPS for 4-6, win win.
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Your smashing it with those QB.
 
freshenstien

freshenstien

Active Member
I'm lucky enough that I run one 1000 watt hps during flower and because it's always cold in my house year round all I have to do is duct a 4in inline fan that pulls 60deg air from inside the house. It pushes the cool air through and the highest temp it gets is 70deg Fahrenheit in the room. I've never used ac in any of my grows because of where I live. I get decent results or at least what I want in terms of weight smell taste frost. I've seen and smoked bud grown under almost every light and never been disappointed. Just factor in as many angles as possible! Its a personal choice!
 
Kingrow1

Kingrow1

Well-Known Member
I posted my last grow which was also posted in uk growers thread previously, the guy was calling me out on being a grower so i posted what i had available as proof. The pics were of one plant i followed from seed to harvest, it did turn out a touch airy but dried up and trimed down pretty good. Out of four two plants were much bigger and denser and a haze hybrid looked like a stretchy sat but i decided to just follow that particular one.

I said its not hard to find evidence here or on google and not that i have achieved this yet but that as getting better i find hps less hot and read better science on leaf cooling and energy budget.

Any airy bud i attribute to bad practice and general error, i have mentioned me being average. Soil is forgiving but as to perfection still pretty hard, yer heat but not like i couldnt focus on growing healthier heat resistant plants like outside rather that wuss lut and buy an exspensive led then come here and act like that part of science i have a simple problem with dosent exist.

As for arguing the point, i dont need to just say what ive simply found and seen, i dont advise anyone to try this especially noobs but i am saying its somthing to work towards over years.

Aussie growers do need to find a basement or cooler spot, a few degrees makes a big diff. Still fuck leds, just get a wider grow space and use t5/8s, way more efficient spreaders of heat than those hot ass leds panels in a tent, fuck houses are lit by em you dont need a tent just a room and desk fan.

Also if hot country growers aint growing one of the few hot weather strains then you shoot yourself in the foot to begin with.

Flowki said:
@Purpsmagurps

This is one of the pics he posted. If I had to be honest the buds look fluffed up because the ambient temps are too warm. Not saying they are ''airy'' but they look fluffed at-least to me.



These are great pics to compare for you king. These buds look more healthy and dense because his ambient temp is likely in a more suitable range (all be it a little too cold). However you can see some actual heat stress on the upper leaves due to having the lights so close. If he had your ambiants and kept the lights that close I would not want to see the result, certainly would not smoke it even for free. Yes maybe their is some time between the two cycles but even with that in mind that's how the two growers results look to me.

Not that those buds are bad Lucky, they look very nice and dense considering your battle with temps.

Since king has not provided any evidence to advocate using hps within inches of plants I feel the need to warn new growers and yourself to never do it when you have your ambient temps in the correct zone. No good grower I have ever read up on keeps lights that close and except for extreme circumstances like luckys.. you will not like the results, trust me.

Root level temps in soil/coco are good at around 68-70F, slightly more or less is no need for concern. You ''can'' for the most part ignore canopy temps at that point becuase the lights when placed at the correct height will do the rest in terms of canopy temp. If you have good climate control you should be able to mostly sustain those root zone temps and mostly ignore canopy temps is what I mean. Instead you then read the plants leaves for heat curling.. move lights up accordingly.

Root temps >> Monitor leaves >> adjust height.

With 600W lighting 18inches is very good height.. resist being greedy thinking closer is better.

I can't say for sure on 400W but I'd personally start it at 14 and see how it goes.

On cmh 315w around 15-16inch is good, they are stronger than you might think. In a small 2x2 or so you may be able to push it closer but I'd be very careful of central heat stress. Those center leaves will yellow out and die off at around week 6/7.. to me that's not a good thing since it is truly avoidable stress. I would not personally want to smoke those surrounding buds.. but I'd definitely smoke the mid level buds directly below them ;p.

So unless king coughs up the proof links ignore him, it's very bad info till then.
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Hempymann

Hempymann

Active Member
HotKarl2 said:
I have both, I haven't decided yet whether I will use the HPS again in the dead of winter. It does simplify the heating issue. However I did the math and still think I come out ahead with the leds, for my tent anyways. I won't know for sure until I try next winter. Anyways, led for 6-8 months, HPS for 4-6, win win.
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Exactly what we've started doing, we have some of the highest electricity prices in the world around here so heating and cooling are major cost factors. LED for most of the year when it's +25c plus. The grow space recently dipped to around 10c so time to fire up the HPS again lol
 
pinner420

pinner420

Well-Known Member
Kingrow1 said:
Cool tubes are pointless, another snake oil product, heat is in the form of light and air dosent change light from heating a surface, mainly your cooling small bulbs not the plant or even helping it transpire.

yer i know you will disagree but heath robinson and many other guys here waaaaaay before you were running plants right up to hps lights with zero heat stress, can rip pics of internet for you no probs if you need visual representation....?
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Some of Heaths pictures are still here. Cool tube salesman must've had his selling shoes strapped on tight...
 
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