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    CMH Lights?

    Looking at adding to and upgrading my lights. A friend suggests a 300W CMH. I'm wondering about heat and power consumption.
    I'm using (2) 300 W LED's now and heat is non existent in my environment. Sounds like the CMH would need some ventilation.
    The projected yields look good.
    What should I know?

    #2
    Here's a comparison of 10 different CMH bulbs. With lots of technical data and light information.

    Comment


      #3
      Green75 has probably had a 315LEC the longest out of us. He'll be able to help
      Completed auto grows 3

      2x4 Gorilla tent
      600W HPS
      Coco
      GH Flora Series trio + Armor Si, CALiMAGic, RapidStart, Liquid KoolBloom, Floralicious Plus, FloraKleen, Diamond Nectar, FloraBlend, FloraNectar (Pineapple Rush version), Dry Koolbloom + Great White mycorrhizae & Terpinator

      Grows using this setup: 1
      Largest yield from this setup: 20oz / 567g

      Previous grows:
      http://forum.growweedeasy.com/forum/...row-first-grow
      http://forum.growweedeasy.com/forum/...world-of-seeds

      Comment


        #4
        Power consumption would be less for sure than 2 300 watt leds... Heat is super minimal..what's your grow space size...

        Comment


          #5
          Thanks for posting, gents.
          I'm using a shower/tub for a grow space. Couldn't be more convenient for dealing with hydro.
          It will have the two 300W LEDs and the new 300W CMH for two Water Farms.
          I was doing the math for 24 hours on, not 18 and then 12. Once I corrected for that, things looked better.
          Heat is my main concern. I'm dealing with almost none now, so I know that will change. But if CMH is cooler than LED, that should be no problem.
          Thanks in advance for any insights.

          Comment


            #6
            Can't speak of LED heat output but I am blown away by how little heat my 315 LEC puts out! It's less than my 288w CFL set up!
            DIY grow space 2.5' X 3.5' X 6.5'
            315 LEC
            6" Vortex exhaust fan w/speed control
            6" Carbon filter
            3- 6" fans
            humidifier
            temp and humidity gauge
            5 gal smart pots w/ FFOF soil
            FF trio nutrients

            Comment


            • Green75
              Green75 commented
              Editing a comment
              Yep......

            #7
            I use led and lec, if you can keep the lec ballast outside of the grow space then heat will be minimal and less than led
            x1 LED Cirrus T5 500w, x3 Sun System LEC315, x1 Nanolux LEC315, Saturn 5 controller, x4 6" can vents, 8800 btu A/C, 70 pint dehumidifier

            Comment


              #8
              Yea my ballast probably puts out more heat than the light does. I opted for the cooling kits. I run 2 phantom 315 LECs in a pretty large flower room absolutely minimal heat compared to my old HPS system. Oh yeah the cooling kits for a waste of money don't buy them.

              Comment


                #9
                I'm useing a 1000w Double ended Hps
                and 1, 1200w LED AT 12 hrs a day.
                plus 1 1200 LED in my Veg room at 18 hrs a day.
                All the fans running, charcoal scrubber running.
                and my hydro bill has gone up 95 bucks a month from this.

                I ran the Metel Halide bulb in it for one month and it was the same.

                if you can I would go with the Double ended lights with digital ballist and a vented hood. stick a duct fan in it blow the heat out the room with dryer hose.
                they come with 15 feet of cable so you can have the ballist out side the room.
                They are 30% more efficient then the ceramic lights.
                this is how I'm set up and I love it
                research it....


                ​​​
                Last edited by 4barrel; 05-09-2017, 08:50 PM.

                Comment


                  #10
                  Originally posted by 4barrel View Post
                  I'm useing a 1000w Double ended Hps
                  and 1, 1200w LED AT 12 hrs a day.
                  plus 1 1200 LED in my Veg room at 18 hrs a day.
                  All the fans running, charcoal scrubber running.
                  and my hydro bill has gone up 95 bucks a month from this.

                  I ran the Metel Halide bulb in it for one month and it was the same.

                  if you can I would go with the Double ended lights with digital ballist and a vented hood. stick a duct fan in it blow the heat out the room with dryer hose.
                  they come with 15 feet of cable so you can have the ballist out side the room.
                  They are 30% more efficient then the ceramic lights.
                  this is how I'm set up and I love it
                  research it....


                  ​​​
                  Thanks for posting! I like the 30% more efficient, but I wonder about wavelengths that plants like/need. LED's seem to still be developing. I do like the two I have.
                  The CMH is getting good reviews in that regard and grams per watt.
                  I'll go look at the unit and decide. Its on sale and I do need to upgrade my light situation.

                  Comment


                    #11
                    Originally posted by Jason View Post

                    Thanks for posting! I like the 30% more efficient, but I wonder about wavelengths that plants like/need. LED's seem to still be developing. I do like the two I have.
                    The CMH is getting good reviews in that regard and grams per watt.
                    I'll go look at the unit and decide. Its on sale and I do need to upgrade my light situation.
                    I think The 1000w D.E. HPS is getting 1gm per watt. cant quite remember
                    but I think that's what it is
                    I know there's a review on them on you tube or Google.

                    also with a dimable digital ballist.
                    it has 4 settings
                    -500w
                    -750w
                    -1000w
                    -1150w (Super Lumins)

                    so as your plants get older ya turn it up gradualy as ya raise your light.
                    But the super Lumins is a bit much.
                    I guess you can use it if your growing full size tall plants. but In my scrog I just about cooked my plants.
                    so dialed it back down to 1000 and found the right distence

                    I'm deffinite getting a second one.
                    then set them on a 750w. disperse the light bit better and bring then down closer.

                    Also with a vented hood, I draw cool air in blowing through the hood and out the room. This way i seel my room and inject Co2 with out losing all my gas out through ventalation.
                    set a small fan on the floor pointing straight up ta keep pushing the gas up and off the floor.
                    Last edited by 4barrel; 05-10-2017, 11:26 AM.

                    Comment


                      #12
                      Just got it. Looks like plug-n-play once you hang it. Which will be mon yanna.
                      Here are the details about the bulb. A friend uses two of these for a 4 x 8 ft grow space and is very happy. My space is pretty much 2 x 2, and I have (2) 300W LED's already installed.
                      So that should be plenty of light for my two Water Farms.

                      Just read that Philips developed the CMH and supposedly makes some of the best for flowering needs.

                      Details
                      Philips Elite Agro 315W T12 Lamp provides a compact and efficient metal halide solution for the horticulture market. This lamp, combined with the efficient ballast, provides outstanding growth light performance over the life of the product.

                      Superior color quality. Crisp white light. Incredibly high 1.95 PPF (photosynthetic photon flux) per watt per second light source. 3100k color temperature, High 92cri, 33,000 initial lumens (105Lm/W). High 90% lumen maintenance at 8,000 hr / High 85% PPF maintenance at 20,000 hr. Unique Open Rated Lamp construction reduces radiant heat from the arc tube and is suitable for open fixture use.

                      General Characteristics
                      Full product name: Mastercolor CDM-T Elite 315W T12 CL Agro P Short product name: CDM ELITE 315W/T12/AGRO
                      • Watts: 315W
                      • Lamp Voltage: 98 V
                      • Lamp Current EL: 3.15 A
                      • Avg. Hrs. Life: 20000 hr
                      • Color Temperature: 3200K
                      • Initial Lumens: 33000 Lm
                      • Energy Efficiency Label (EEL) A+
                      • Energy consumption kWh/1000h: 315 kWh

                      Edit- Just plugged it in for a heat check. This 300W CMH light is BRIGHT! compared to my 300W LED's. Hopefully, they will play well together.
                      Half an hour into the test and I'm impressed by how little heat is generated. It is one hot quartz bulb, but heat out put seems low.
                      Last edited by Jason; 05-10-2017, 01:43 PM.

                      Comment


                        #13
                        Originally posted by Jason View Post
                        Just got it. Looks like plug-n-play once you hang it. Which will be mon yanna.
                        Here are the details about the bulb. A friend uses two of these for a 4 x 8 ft grow space and is very happy. My space is pretty much 2 x 2, and I have (2) 300W LED's already installed.
                        So that should be plenty of light for my two Water Farms.

                        Just read that Philips developed the CMH and supposedly makes some of the best for flowering needs.

                        Details
                        Philips Elite Agro 315W T12 Lamp provides a compact and efficient metal halide solution for the horticulture market. This lamp, combined with the efficient ballast, provides outstanding growth light performance over the life of the product.

                        Superior color quality. Crisp white light. Incredibly high 1.95 PPF (photosynthetic photon flux) per watt per second light source. 3100k color temperature, High 92cri, 33,000 initial lumens (105Lm/W). High 90% lumen maintenance at 8,000 hr / High 85% PPF maintenance at 20,000 hr. Unique Open Rated Lamp construction reduces radiant heat from the arc tube and is suitable for open fixture use.

                        General Characteristics
                        Full product name: Mastercolor CDM-T Elite 315W T12 CL Agro P Short product name: CDM ELITE 315W/T12/AGRO
                        • Watts: 315W
                        • Lamp Voltage: 98 V
                        • Lamp Current EL: 3.15 A
                        • Avg. Hrs. Life: 20000 hr
                        • Color Temperature: 3200K
                        • Initial Lumens: 33000 Lm
                        • Energy Efficiency Label (EEL) A+
                        • Energy consumption kWh/1000h: 315 kWh

                        Edit- Just plugged it in for a heat check. This 300W CMH light is BRIGHT! compared to my 300W LED's. Hopefully, they will play well together.
                        Half an hour into the test and I'm impressed by how little heat is generated. It is one hot quartz bulb, but heat out put seems low.
                        Ok well,
                        doing lots of research, research,research on diffrent options before purchase is all ways in your best intrest.
                        and it sounds like ya got this.
                        Hope it works for ya, Happy growing

                        Comment


                          #14
                          Thank you.
                          I started with (2) $70 Full Spectrum (?) LED's from Amazon for the first grow, harvested early April.. Very happy with the results. Now trying to fine tune and up out put.
                          My friend that has been growing indoors since the '80's (Holland and US) uses these and likes them.

                          Comment


                            #15
                            So I almost ruined the new light. Unplugged it after running most of the day, to plug into a timer. I DID NOT let it cool. It didn't start properly, so I immediately unplugged it. Now I'm told not to plug it in
                            while the ballast is hot. So I let it cool, plugged into the timer and all is well.

                            Comment

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