Philips 315w CDM Elite (CMH)

[el6magiko]

hello guys i was reading about hotspots on open fixture lamps in vertical setup but cant find where it all started so i have a question.I am gonna be running 2x942 t12 one from top and second one from bottom mounted on camera tripod.So the tips will be few cm apart,will this be a problem,should i paint the tips or is it not necessary?thanks

 

[bloyd]

I had terrible results with the atl 315 mogul in a vertical configuration. There was a narrow band that would get fried even at 2-3 foot distance. At that distance anything not in the narrow band wasn't getting adequate light for dense flowers.

I

 

[el6magiko]

did you use it in reflector?maybe i didnt write it well im just gonna use lamps without reflector,one hanging on a wire from the top and another one mounted on camera tripod from bottom and flowers around them in a circle.

 

[LastHurrah]

I had terrible results with the atl 315 mogul in a vertical configuration. There was a narrow band that would get fried even at 2-3 foot distance. At that distance anything not in the narrow band wasn't getting adequate light for dense flowers.
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That's what I was afraid of... one must use a reflector (greenbeams, phantom, etc.) to take full advantage iof this technology.

Who's doing the side by side by side? Is the Greenbeams truly worth the extra expense?

LH

 

[bloyd]

did you use it in reflector?maybe i didnt write it well im just gonna use lamps without reflector,one hanging on a wire from the top and another one mounted on camera tripod from bottom and flowers around them in a circle.

No reflector 2 bulbs stacked just like you are proposing. If you look at the bulb all of the light is coming from a concentrated sphere whereas a traditional hps spreads those photons throughout a longer arc tube giving more even dispersion and better results ime. Would really like to try a greenbeams based on scrappy's experience.

 

[rives]

That's what I was afraid of... one must use a reflector (greenbeams, phantom, etc.) to take full advantage iof this technology.

Who's doing the side by side by side? Is the Greenbeams truly worth the extra expense?

LH

Might want to check here - https://www.icmag.com/ic/showthread.php?t=316539

 

[Jhhnn]

hello guys i was reading about hotspots on open fixture lamps in vertical setup but cant find where it all started so i have a question.I am gonna be running 2x942 t12 one from top and second one from bottom mounted on camera tripod.So the tips will be few cm apart,will this be a problem,should i paint the tips or is it not necessary?thanks

T12's are peculiar in that the double jacket design creates a strong beam of light straight out the end of the lamp. In your case, it'll just hit the floor unless you put a small conical reflector under the lamp to turn the light in another direction. Easy-peasy

I had a link to a graph of that but Philips has been moving stuff around, again.

 

[el6magiko]

i am getting confused againbloyd said he was getting a belt of light that was overpowered but wouldnt this happen also on regular mh light which has similar designed bulb?and wouldnt this beam be also problem if you had 315 mounted horizontal with or without hood?or is there some other thing i am missing?i get it that if you have greenbeam hood this probably isnt a problem.

 

[el6magiko]

anyone?

 

[Jhhnn]

i am getting confused againbloyd said he was getting a belt of light that was overpowered but wouldnt this happen also on regular mh light which has similar designed bulb?and wouldnt this beam be also problem if you had 315 mounted horizontal with or without hood?or is there some other thing i am missing?i get it that if you have greenbeam hood this probably isnt a problem.

You're not missing anything. You may be reading too much into it, that's all.

Cycloptics discovered that the T12 lamp created a hotspot out past the end of the lamp & put a dot of high temp silver paint on their lamps to get that super even light distribution they want. In a horizontal reflector that effect goes away because it's diffused by reflection. In a scheme where the lamps hang vertically with plants around it doesn't matter either because the hotspot is on the floor rather than the plants unless you spread the light out horizontally with a small conical reflector.

Capische?

 

[el6magiko]

i think you are right jhhnn im overreading thisi perfectly understand everything that you wrote,but still question remains would i benefit with painting tips?and another more important. ill just paste what bloyd wrote:I had terrible results with the atl 315 mogul in a vertical configuration. There was a narrow band that would get fried even at 2-3 foot distance. At that distance anything not in the narrow band wasn't getting adequate light for dense flowers.
Quote:
Originally Posted by el6magiko View Post
did you use it in reflector?maybe i didnt write it well im just gonna use lamps without reflector,one hanging on a wire from the top and another one mounted on camera tripod from bottom and flowers around them in a circle.
No reflector 2 bulbs stacked just like you are proposing. If you look at the bulb all of the light is coming from a concentrated sphere whereas a traditional hps spreads those photons throughout a longer arc tube giving more even dispersion and better results ime. Would really like to try a greenbeams based on scrappy's experience.

this was my question referred to. can you advise please?

 

[oti$]

I'm having second thoughts about stacking them vertically after reading bloyd 's post. From what he experienced it looks like the light will be either too intense or not intense enough...or both simultaneously Making it difficult to hit a sweet spot with vertically oriented bulbs

 

[bloyd]

Just relaying my experience. Feel free to give it a try, but i think you will be changing to a reflector your second run.

There is probably a reason nobody has a thread killing it with these 315s hung bare vertical. I think if it worked well in that fashion we would know by now.

 

[Hammerhead]

Is that only using them in a bare bulb configuration?.

 

[bloyd]

Is that only using them in a bare bulb configuration?.

Yes, they work great in a reflector best veg light I have used.

They just don't disperse the light evenly and effectively in vertical configuration without a reflector.

Again anybody feel free to give it a try maybe the t9 bulbs would perform better but my experience was not good.

 

[Hammerhead]

I agree, the 3 I use in veg are killing it.

 

[RightOnTarget]

Finally got a Dpapillon with greenpower bulb, the light is so damn crisp and bright. For those watts it's surprisingly bright and temperatures are more than great, 40cm below the fixture 25.5C in a 1x1m. I should've got that in the beginning of this run.

Have a nice weekend everyone and kudos to all who have contributed their knowledge to this topic. Stay safe!

 

[el6magiko]

Yes, they work great in a reflector best veg light I have used.

They just don't disperse the light evenly and effectively in vertical configuration without a reflector.

Again anybody feel free to give it a try maybe the t9 bulbs would perform better but my experience was not good.

i believe you my friend and thanks for saying this i think it will help people who want to do cmh vertical bare bulb.but i am wondering two things wouldnt this design also be a problem if you put the light horizontaly without reflector?i am worried about that intense belt of light,i get it that if you put it in reflector you get better distribution but that belt still remains?anyone thinks mogul base would have something to do with it also?and metal halides have similar arc,and does this also happen with them(never used one before),i am not really into graphs and stuff?sorry for so many posts but you cant learn if you dont ask.thanks and stay safe.

 

[bloyd]

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i believe you my friend and thanks for saying this i think it will help people who want to do cmh vertical bare bulb.but i am wondering two things wouldnt this design also be a problem if you put the light horizontaly without reflector?i am worried about that intense belt of light,i get it that if you put it in reflector you get better distribution but that belt still remains?anyone thinks mogul base would have something to do with it also?and metal halides have similar arc,and does this also happen with them(never used one before),i am not really into graphs and stuff?sorry for so many posts but you cant learn if you dont ask.thanks and stay safe.

I have no burning issues in an open horizontal reflector even at close distances. Can't say I understand it, but this is what I have experienced using these for the last 2 years.

 

[Jhhnn]

i believe you my friend and thanks for saying this i think it will help people who want to do cmh vertical bare bulb.but i am wondering two things wouldnt this design also be a problem if you put the light horizontaly without reflector?i am worried about that intense belt of light,i get it that if you put it in reflector you get better distribution but that belt still remains?anyone thinks mogul base would have something to do with it also?and metal halides have similar arc,and does this also happen with them(never used one before),i am not really into graphs and stuff?sorry for so many posts but you cant learn if you dont ask.thanks and stay safe.

Avenger posted this earlier-

https://www.icmag.com/ic/showpost.php?p=7331186&postcount=1645

The graphs at the top are like cutting a donut in half sideways & looking at the cross section. the line represents the shape of the donut, the limit of light of a certain intensity. The T12 lamps have a tail of high intensity light at the bottom of the graph that corresponds with the tip of the lamp. It's created by the refractive/reflective qualities of the outer envelope. If that tail isn't pointed at the plants it doesn't matter.