MH vs. HPS (heat)
- Thread starter lunyk
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We TaRdED
Well-Known Member
should be the same.... a 400 watter is 400 watts. a 400 watt, incandescent(aka a regular bulb) or four 100w bulbs, will produce the same amount of heat, just alot less light. it doesnt even need to produce light at all to produce the same heat, for example, if you have a 400 watt space heater running it will produce the exact amount of heat as a 400 watt bulb.
so no, there should be no difference in heat...
That's not correct. A bulb's efficiency is based on how much of it's energy usage is converted into heat energy.
The more heat produced, the less effecient. For instance, a 400 watt HPS light will produce less heat (and more light) than a 400 watt halogen bulb.
The effeciency depends on how much of the bulb's allotted 400 watts is converted into heat energy, and how much is converted into light.
We TaRdED
Well-Known Member
right, theres some truth to that. i was going to extrapolate but i didnt want to confuse the kid. the difference in efficiency between the mh and hps is not that large and thus i didnt get into that. have you heard of "kiss"? it stands for Keep It Simple Stupid.
"The more heat produced, the less effecient. For instance, a 400 watt HPS light will produce less heat (and more light) than a 400 watt halogen bulb."
let me ask you though, what happens to that light that isnt apart of the "heat"? does it not get absorbed by plants, walls, floors, etc? what happens then? it turns to heat and energy. just because it not IR energy doesnt mean that it doesnt eventually turn into IR/heat.
what do you have to say about that pussy?
BigBudBalls
Well-Known Member
You guys also forgot that there are 2 heat producing items in the system. That ballast gets might warm too.
(just to confuse more
)
(just to confuse more
)I understand your need to "KISS," however you were making some pretty wild claims there. I beleive you stated a 400 watt space heater will give off the same amount of heat as a 400 watt bulb. That's completely out of the realm of comprehension.right, theres some truth to that. i was going to extrapolate but i didnt want to confuse the kid. the difference in efficiency between the mh and hps is not that large and thus i didnt get into that. have you heard of "kiss"? it stands for Keep It Simple Stupid.
"The more heat produced, the less effecient. For instance, a 400 watt HPS light will produce less heat (and more light) than a 400 watt halogen bulb."
let me ask you though, what happens to that light that isnt apart of the "heat"? does it not get absorbed by plants, walls, floors, etc? what happens then? it turns to heat and energy. just because it not IR energy doesnt mean that it doesnt eventually turn into IR/heat.
what do you have to say about that pussy?
So, forgive me for politely correcting you.
You are correct however, no energy transfer is 100% effecient, and thus loses energy in the form of heat (also known as entropy). Photosynthesis is not excluded and does lose energy in the form of heat. However that is entirely out of the scope of the OP's question. He asked how much heat was directly given off by the bulb.
By the way, your use of the word "extrapolate" was incorrect. I believe the word you were thinking of was "interpolate." (Ok, I'll admit, I was being a douche there
)
We TaRdED
Well-Known Member
I understand your need to "KISS," however you were making some pretty wild claims there. I beleive you stated a 400 watt space heater will give off the same amount of heat as a 400 watt bulb. That's completely out of the realm of comprehension.
So, forgive me for politely correcting you.
You are correct however, no energy transfer is 100% effecient, and thus loses energy in the form of heat (also known as entropy). Photosynthesis is not excluded and does lose energy in the form of heat. However that is entirely out of the scope of the OP's question. He asked how much heat was directly given off by the bulb.
By the way, your use of the word "extrapolate" was incorrect. I believe the word you were thinking of was "interpolate." (Ok, I'll admit, I was being a douche there
ex·trap·o·late
(ĭk-strāp'ə-lāt') Pronunciation Key v. ex·trap·o·lat·ed, ex·trap·o·lat·ing, ex·trap·o·lates
v. tr.
- To infer or estimate by extending or projecting known information.
- Mathematics To estimate (a value of a variable outside a known range) from values within a known range by assuming that the estimated value follows logically from the known values.
Conservation of energy - Wikipedia, the free encyclopedia
im not going to go crazy and take lots of time to study. but i thought that when light is absorbed by an entity that the heat is transfered. thus even if the 400w bulb is 50% efficient(i doubt its close to that, not going to seach though), 200w is being given off as heat and 200w is turned into light which the plant can absorb and use. the 200w of light once absorbed gets turns into heat....... right? so in a little closet, your going to get 400w of heat whatever way you look at it.... no?
"I beleive you stated a 400 watt space heater will give off the same amount of heat as a 400 watt bulb. That's completely out of the realm of comprehension."
is it really "completely out of the realm of comprehension" in a contained space, a 400w space heater VS a 400w hps bulb.
so you think that the slight difference in efficiency between hps and mh have a discernible heat difference???????? thats why i didnt extrapolate and used the KISS method.
its ok you being a douche, you are what you eat right? lol jk, naw its kool, i started name calling and pushing buttons first.
We TaRdED
Well-Known Member
he did?
if my eyes serve me correct, it says "i wondered if one of both bulbs produced more heat than the othe one?"i dont see anything written about "how much heat was directly given off by the bulb."
i do see that he asked if either bulb produced more heat than the other one.
heres some advice for you- keep it simple STUPID. (i admit, i was being a douche here!) lol
Mr Green Man
Well-Known Member
I love the way you asked a simple quetion about light and got a raw about the use of the word extrapolate, why don't you guys just get the tape messure out and get it over with. LOL
I real don't want to say, but here is a simple test, stick in the HPS Bulb for a few hours and messure the heat in the room and then do the same with MH, it's not terribly sicentific but should give you a ruth idea.
Please Excuse my spelling. Dislexic.
I real don't want to say, but here is a simple test, stick in the HPS Bulb for a few hours and messure the heat in the room and then do the same with MH, it's not terribly sicentific but should give you a ruth idea.
Please Excuse my spelling. Dislexic.
We TaRdED
Well-Known Member
yes, just get a HPS system and buy a MH conversion bulb. you can grow pot with either one though. a mh is better for vegging, a hps is better for flowering. hps produced more lumens/watt, i dont have enough hands on experience to tell a difference myself.
as long as the temp inside the room is the same when you start your system, also ambient outside temps would be a factor to watch out for too. if there was a big(10degrees or so) outside temp fluctuation it might/would effect your inside temp and throw off your reading.
let us know how you make out.
"The easiest way to explain heat transfer by RADIATION is by the heat we feel from the sun. Even though the sun is about 93 million miles away from the earth, we still feel some of its heat. It travels to earth through the vacuum (no air) of space by way of rays!If you hold your hand near a light bulb (but not too close!), much of the heat that you feel is from RADIATION. How else is the light bulb transferring heat to your hand. Would you guess CONVECTION or CONDUCTION."
radiant energies produce heat. anyone have a definite answer? 400w is 400w until someone disproves me.
BigBudBalls
Well-Known Member
Yup! You are right. 400w is 400w.
Watts is power dissipation. So anywhere in the system there is heat, there is poser dissipation.
Lets see.
The bulb. really hot!
The ballast damn warm!
Then there is the wiring. Copper is an *excellent* conductor of heat. So the wire is pulling heat out of the bulb and ballast. (not much at all, but it is to some degree.)
So, I haven't done any tests, but its quite possible that on a HS system, the ballast is dissipating 100W and the bulb 300 while on a MH system, the ballast 125 and the bulb 275. Remember, these bulbs are NOT just a resistive tungsten fillement. So the draw can easily be different.
So yes you are right but haven't answered the original question because it can easily (and should be) a remote ballast.
We TaRdED
Well-Known Member
i thought the bulbs were producing the rated watts while the ballasts produced extra watts. for example, a 400w system produces 400w of radiant energy at the bulb, while the ballast produces its own watts/heat/radiant engergy. so a 400w system would be..... just a guess...... 500w all together from the outlets point of view.
BigBudBalls
Well-Known Member
I wouldn't have thought that, just going by a floro light.
You could be right on that Will need to check that.
You could be right on that Will need to check that.
We TaRdED
Well-Known Member
ya im pretty sure. but i usually never say im definite about things, that way if im wrong i wont look like such an ass. but usually im right, otherwise i try and keep my mouth shut and learn. read my posts if you want.
panhead
Well-Known Member
HPS 400 watts,reading taken with thermometer pointed at the filiment = 117 degrees.
MH 400 watts,reading taken with thermometer pointed at the filiment = 109 degrees.
Seeing that the temps were so close i didnt bother taking measurements at the ballasts.