CMH Edison Screw Vs Pinned Lamps

[Chrystal]

I have just been looking into this again and i am wondering if any knows the difference between the 315w CMH with the pin lamp vs the 250w CMH that can run on a HPS ballast? i see one guy on ebay claims his 250 HPS ballast can run this CMH lamp but he doesn't have a listing for the lamp, later on a google search i found these

 

http://www.eyelighting.com/products/hid-lamps/conversion-retrofit-systems/hps-to-cmh/

 

listing claiming CMH can run off hes HPS ballast

 

http://www.ebay.com.au/itm/JB-250W-BALLAST-FOR-HPS-CMH-HYDROPONICS-GROW-LAMPS-/112029111766

 

 

[Sir PsychoHashy]

If you look at the 1st link, under usage applications there's no mention of horticulture.

 

As for the 2nd, it's a direct claim, so it should run both globes.  But I would be wary, and would also wonder why you would want to be able to chop and change between HPS and CMH.  Big problem I would have is that on my very limited understanding, CMH lamps run on a very different frequency to HPS, much much lower I think????  So I would worry that one, or both, globes would not be able to produce their full light spectrum and strength properly as a result.  But that's all conjecture, and further research would be needed before making any conclusions.

 

Logic says it sounds too good to be true, with a cheap CMH ballast coming in much more expensive, so I'd be surprised if there wasn't a very big catch.

 

[Chrystal]

If you look at the 1st link, under usage applications there's no mention of horticulture.

 

As for the 2nd, it's a direct claim, so it should run both globes.  But I would be wary, and would also wonder why you would want to be able to chop and change between HPS and CMH.  Big problem I would have is that on my very limited understanding, CMH lamps run on a very different frequency to HPS, much much lower I think????  So I would worry that one, or both, globes would not be able to produce their full light spectrum and strength properly as a result.  But that's all conjecture, and further research would be needed before making any conclusions.

 

Logic says it sounds too good to be true, with a cheap CMH ballast coming in much more expensive, so I'd be surprised if there wasn't a very big catch.

 

 

Yeah some good points, i checked out the ES lamps and they come in 3000K and 4000K some claimed 830 which i have seen the pin type lamps also claimed 830 but i don't understand it yet

 

if u can get full brightness it may be worthy of trying, if my LED's don't pan out i might try these lamps

[Sir PsychoHashy]

Yeah some good points, i checked out the ES lamps and they come in 3000K and 4000K some claimed 830 which i have seen the pin type lamps also claimed 830 but i don't understand it yet

 

if u can get full brightness it may be worthy of trying, if my LED's don't pan out i might try these lamps

 

Pretty sure the Phillips CMH/LEC lamps come in 930 and 942, might have them mixed up but I think the 942 is for veg, and the 930 for flower but can be used for both.  So 830 doesn't sound right, but I don't understand what the number really mean, so I just let others tell me what's right and go with that .  Spectrum is the important thing, so look at that and see if it's got what the plants need.  Again, I don't know, but the reckon the Phillips CMH globes have good PAR, and that the spectrum is close to natural sunlight, so personally I'd rather drop a little extra coin on something specialised like that.

[Chrystal]

Yeah the only thing is cost of those CMH cheapest i found was $500 or $400 shipped from China, they are not cheap

 

how much heat do these 315w put out compared to a 400w light?

[Sir PsychoHashy]

Yeah the only thing is cost of those CMH cheapest i found was $500 or $400 shipped from China, they are not cheap

 

how much heat do these 315w put out compared to a 400w light?

 

Not too sure compared to a 400w HPS, but considerably less than a 600w.  Anecdotally people compare them to the 600w HPS for production, but the best temp info I can offer is that FIWH did some measurements on the 315 in the following thread:

 

https://cannabis.community.forums.ozstoners.com/topic/66133-phillips-315w-lec-with-d-papillon-reflector/

[Chrystal]

I read into that thread thanks hashy, a lot of people raving and ranting nothing about the lights at that point i stopped reading...

 

looks like these little 315w put out 300umols my little diy LED is pumping out 380umols but its very narrow band of beam

[Chrystal]

 

Hi mate I am using 2 x 375w CMH lamps and I agree, they give compact lush growth with less stretch than with a HPS. The light spectrum in the UV and red are heaps better than std MH or HPS. My plants grow strong like they would outside in the sun. I will never look back.

Tangwena

 

Oh yeah I forgot to add the heat output is much lower than HPS so much so that I have been able to grow right through summer no problems.

Tangwena

 

Mine are from EYE lighting CMH, Assie company who specialise in lighting. Check out their web site. They run off std MV running gear $85.00 from Electrical wholesalers, Globe 375w clear, which lets through the UV, so much so, I got a sun tan on one half of my face in about 30 secs.

I now use 50+ and sunnies when I work near them.

You can get them from specialist lamp suppliers, not hydro stores that I know of. $120.00

But Philips have a bulb that runs of your HPS gear. But its only available ex EU or USA.

I am totaly convinced it was these bulbs that let me grow a big sativa indoors. The plant looked just like an outdoor grow.

Tangwena

 

Think I'm sold on one of these, a 250watt version, found the lamps in the USA on Ebay