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whatissixbynine
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HempiPukets
New member
Where to buy in europe?
Where to buy in europe?
Any clues who sells these in EU?
Where to buy in europe?
Any clues who sells these in EU?
anyone know where to get the low wattage electronic ballast from GE for CMH lamps? more info
I type it in google and can't fine one retailer ?
EDIT: just found a retailer. seems though as no one has ever used one of these to fire a CMH lamp?
also see the "new" electronic ballast for the 250-400 CMH ? looking at it again, why does it start at 220 volts? no 120 line ? I'm not an electrician but does that mean we can't use them in the US ?
I type it in google and can't fine one retailer ?
EDIT: just found a retailer. seems though as no one has ever used one of these to fire a CMH lamp?
also see the "new" electronic ballast for the 250-400 CMH ? looking at it again, why does it start at 220 volts? no 120 line ? I'm not an electrician but does that mean we can't use them in the US ?
Last edited:
simba
Sleeping Dragon
ASDE,
I wasnt ignoring the Q.. Just pondering how to respond in a way it wont be misunderstood...(im still on that<in my words not others posts)
ya i said the 1,10 was lil off and i was considering the abs range of the plant at 650 IE C2, even 2.5X at that range is still Better IMPHO..
Habeeb,
if you look closer on your last link they have the CDM400S51/HOR in that Ge Ultramax.
You can run it on house power.. using the the 2 hots and ground.. (Make sure you have 2, 5 amp breakes/fuses.. for a total amp avail of 10amps to help ensure u dont Fry if you short them out, allows for 4 of these at 400 watt )
I wasnt ignoring the Q.. Just pondering how to respond in a way it wont be misunderstood...(im still on that<in my words not others posts)
ya i said the 1,10 was lil off and i was considering the abs range of the plant at 650 IE C2, even 2.5X at that range is still Better IMPHO..
Habeeb,
if you look closer on your last link they have the CDM400S51/HOR in that Ge Ultramax.
You can run it on house power.. using the the 2 hots and ground.. (Make sure you have 2, 5 amp breakes/fuses.. for a total amp avail of 10amps to help ensure u dont Fry if you short them out, allows for 4 of these at 400 watt )
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whatissixbynine
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Habeeb,
if you look closer on your last link they have the CDM400S51/HOR in that Ge Ultramax.
You can run it on house power.. using the the 2 hots and ground.. (Make sure you have 2, 5 amp breakes/fuses.. for a total amp avail of 10amps to help ensure u dont Fry if you short them out, allows for 4 of these at 400 watt )
Simba, thank you. I have hooked up many ballast before, but I'm not understanding this new setup,
I can just buy a "lamp cord", and hook it up and it will run on a 120 volt? also how do you ground the ground wire if your just wiring together a cord ? doesn't the ground wire have to be touching metal like in a ballast box ?? or do I just connect the green wires together ( one form the ballast and one from the lamp cord )
just don't wanna burn down anything here
also, how cool are the electronic ballast? alot cooler then a standard HPS ballast?
thanks for any info anyone
You can't do the integrals and compare because the power spectral density is given in relative units.
Are they not relative to one another? Meaning 0 is 0 for both and 100 is 100 for both?
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whatissixbynine
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my thoughts (which are in no way the thoughts of an expert) when comparing 2 bulbs of the same wattage being used in the same ballast both will have the same input energy to the bulb itself (in this case 400w). Some of that energy will be emitted as light in the spectrum desired, the rest will be emitted as heat. If both bulbs heat up to the same temperature then they will also be emitting similar amounts of photons.
This is why I assumed in my previous post to integrate the spectrums against the plant response curve to compare final tallies.
However, all of my research prior to coming to this forum was based on algae where the cellular structure was simple compared to the leaf structure of a higher order plant like mj. Others who have posted lead me to believe that a high order plant like mj can accommodate itself to whatever light source is available through producing the accessory pigments that are necessary to channel and modify (fluorescence) the light to accomplish photosynthesis. Therefore it may not be so important that a normal hps emits so much of its light in the yellow/orange range of the spectrum.
However, my counter thought to this is that if higher order plants are so able to adapt themselves to the available light why doesn't the mj growers use low pressure sodium lights? They are more efficient at turning energy into light (hence why they are used in parking lots) and should be able to grow plants. But, I have been told that low pressure sodium lights cannot be used to grow so I am led to believe that the quality of the emitted spectrum is still important. After all, it has been said by many people that blue and red are the most important parts of the spectrum for growing and it is maxed at the absorption spectrum of chlorophyll a (the pigment responsible for the free electron that kicks off the calvin cycle).
These are just my thoughts so please be kind if I am mistaken somewhere.
This is why I assumed in my previous post to integrate the spectrums against the plant response curve to compare final tallies.
However, all of my research prior to coming to this forum was based on algae where the cellular structure was simple compared to the leaf structure of a higher order plant like mj. Others who have posted lead me to believe that a high order plant like mj can accommodate itself to whatever light source is available through producing the accessory pigments that are necessary to channel and modify (fluorescence) the light to accomplish photosynthesis. Therefore it may not be so important that a normal hps emits so much of its light in the yellow/orange range of the spectrum.
However, my counter thought to this is that if higher order plants are so able to adapt themselves to the available light why doesn't the mj growers use low pressure sodium lights? They are more efficient at turning energy into light (hence why they are used in parking lots) and should be able to grow plants. But, I have been told that low pressure sodium lights cannot be used to grow so I am led to believe that the quality of the emitted spectrum is still important. After all, it has been said by many people that blue and red are the most important parts of the spectrum for growing and it is maxed at the absorption spectrum of chlorophyll a (the pigment responsible for the free electron that kicks off the calvin cycle).
These are just my thoughts so please be kind if I am mistaken somewhere.
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whiterasta
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I think the amount of photons emitted in infra-red has quite a lot to do with CMH operating cooler.
In terms of absolute # of photons emitted, CMH produce more in the usable range and less as heat.
compared to other HID CMH emit less infra-red photons thus operate cooler per X# of photons emitted, opinion?
WR
The what is nanometers within a given range. In the graphs these are both laid on the same scale. The only question is if the amount of energy emitted in the range of nanometers tested is the same scale as the other graph.
If they are the same scale, meaning 1 is a value of 1 for both graphs, then it is a direct comparison between the energy release of both bulbs. Let's just call one area of the graph "blue". If light A produces a value of 50 on the blue scale...and light B also produces a value of 50 on the blue scale, is that not a direct comparison showing that in the blue range both bulbs perform equally? And if light A produces a value of 75 on the "red" scale, while light B produces 80 on the "red" scale, is that not a direct comparison showing that light B puts our more energy at the red level of light.
And what does it matter what these units of energy are if they are the same for both lamps?
These graphs were complied using testing equipment and software, not advertising geeks running dot to dot graphs.
TheFallenLion
Member
CMH has officially arrived in the mainstream, SEVERAL hydroponic stores now carry them, and not only that but OPENLY PRAISE. This is a whole new level, To all those early adapters I think we're going to have a lot more company in the future.
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whatissixbynine
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whatissixbynine, that is quite a post... takes me back to my days as a physics graduate student. But, for this discussion the mathematics are all done by whatever spectral analyzer you've purchased to make your measurements. Unforntunately for us lighting manufacturers normalize their curves such that the highest peak occurs at a relative value around 100 (or 1000, or 1) so as to show you the lighting quality without actully giving you the energy. From what I've been able to find online a typical spectral analyzers will give you photon counts per nm channel (and not the radient flux per nm) which then allow you to construct the graphs we typically see. What we would like to see is the radiant flux per nm as graphs for all bulbs and then we call all be absolutely sure in our comparisons between bulbs.
Again, this is why I said in an above post that HID lights of the same wattage can be roughly assumed to output similar amounts of light energy (the difference being the energy wasted as heat(bulb temperature)).
What we need is someone with a spare $4000 lying around to purchase one of these http://oceanoptics.com/Products/xrseries.asp and set up a testing facility.
Again, this is why I said in an above post that HID lights of the same wattage can be roughly assumed to output similar amounts of light energy (the difference being the energy wasted as heat(bulb temperature)).
What we need is someone with a spare $4000 lying around to purchase one of these http://oceanoptics.com/Products/xrseries.asp and set up a testing facility.
Help me out
Help me out
Hi guys been with this one from the start & a few others. This one seams to have all the experts & boffins in one place. So can someone show me the spectrum, tell me if this colour temp would be any good.
400w @1800k & 10000k .what would the 2 bulbs together make, im no expert and i need in layman's terms. Is it the sun spectrum we are looking for or is there something better, we can make, you tell me.
Help me out
Hi guys been with this one from the start & a few others. This one seams to have all the experts & boffins in one place. So can someone show me the spectrum, tell me if this colour temp would be any good.
400w @1800k & 10000k .what would the 2 bulbs together make, im no expert and i need in layman's terms. Is it the sun spectrum we are looking for or is there something better, we can make, you tell me.
the 10,000k bulb sounds like a metal halide for reef tanks:
I can't find a spectrum for 1800k as this is the color of a candle flame, did you mean 18000k? If so then the spectrum will be similar to the top chart.
I imagine the 10K kelvin bulb would be fine for veg, but not adaquate for flowering.
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whatissixbynine
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ye thats true
hps >400w produce more (efficient) photons in usable range
it emits less short band infra-red compared to hps yes, thats the the reason why it runs cooler
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whatissixbynine
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