# Help Please. First time set up **URL:** \ **Category:** Lighting\ **Created:** [February 12, 2020, 10:18am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987 "2020-02-12T10:18:46Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![LMP1](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/lmp1/32/285524_2.png) [@LMP1](https://ilgmforum.com/u/LMP1)\ **Post date:** [February 12, 2020, 10:18am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/1 "2020-02-12T10:18:46Z")
Hi, My tent is W100cm x L100cm x H200cm. Please could someone tell me what HPS light would be best, Also what size extractor would be suitable for the light wattage. ---
**Author:** ![Watt-Sun](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/watt-sun/32/193796_2.png) [@Watt-Sun](https://ilgmforum.com/u/Watt-Sun)\ **Post date:** [February 12, 2020, 10:44am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/2 "2020-02-12T10:44:47Z")
How many plants do you plan on growing ? (Quickly googling what 100 centimeters is in feet šŸ¤£) ---
**Author:** ![LMP1](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/lmp1/32/285524_2.png) [@LMP1](https://ilgmforum.com/u/LMP1)\ **Post date:** [February 12, 2020, 10:58am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/3 "2020-02-12T10:58:40Z")
šŸ¤£ Its 1 meter sq, 2 meters high. No more than 3/4. ---
**Author:** ![TommyBahama](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@TommyBahama](https://ilgmforum.com/u/TommyBahama)\ **Post date:** [February 12, 2020, 4:57pm UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/4 "2020-02-12T16:57:03Z")
You can use a 400 watt or 600 watt HID light in that space. Be sure to get a digital dimmable ballast so that you can adjust the wattage as needed. Be sure to get an air-cooled hood. The hood will have a 6 inch inlet/outlet, so that determines what size exhaust fan you will use (6 inch). growershouse has good deals on complete HID kits - digital ballast, air-cooled hood, and an HPS bulb. Since you stated your tent size in metric measurements, I suspect you arenā€™t in the United States. But, you can still use their site to get an idea of what you should look for. If you purchase a kit like that, I would recommend buying an MH bulb at the same time, to use during the vegetative stage. ---
**Author:** ![LMP1](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/lmp1/32/285524_2.png) [@LMP1](https://ilgmforum.com/u/LMP1)\ **Post date:** [February 12, 2020, 6:30pm UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/5 "2020-02-12T18:30:25Z")
Hi Tommy. Wow thank you for all that info bro, much appreciated. šŸ‘ ---
**Author:** ![Myfriendis410](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/myfriendis410/32/556067_2.png) [@Myfriendis410](https://ilgmforum.com/u/Myfriendis410)\ **Post date:** [February 12, 2020, 6:38pm UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/6 "2020-02-12T18:38:06Z")
> [@Watt-Sun](#): > > 100 centimeters is That would be 1 meter or 39 1/2". ---
**Author:** ![Watt-Sun](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/watt-sun/32/193796_2.png) [@Watt-Sun](https://ilgmforum.com/u/Watt-Sun)\ **Post date:** [February 12, 2020, 6:49pm UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/7 "2020-02-12T18:49:36Z")
šŸ‡ŗšŸ‡øā€˜Murica!ā€™ šŸ‡ŗšŸ‡ø šŸ¤£šŸ˜‚ ---
**Author:** ![LMP1](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/lmp1/32/285524_2.png) [@LMP1](https://ilgmforum.com/u/LMP1)\ **Post date:** [February 12, 2020, 10:36pm UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/8 "2020-02-12T22:36:40Z")
šŸ‡¬šŸ‡§/ šŸ‡ŖšŸ‡ø šŸ¤£ ---
**Author:** ![Nicky](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/nicky/32/397422_2.png) [@Nicky](https://ilgmforum.com/u/Nicky)\ **Post date:** [February 12, 2020, 10:55pm UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/9 "2020-02-12T22:55:50Z")
Why did you recommend MH over CMH? ---
**Author:** ![orb932](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/orb932/32/280001_2.png) [@orb932](https://ilgmforum.com/u/orb932)\ **Post date:** [February 12, 2020, 11:12pm UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/10 "2020-02-12T23:12:38Z")
As an LED advocate if you have the money Iā€™d recommend getting an LED like and HLG or if youā€™re not a DIY person maybe buy a gavida or something similar, just if you go LED do not buy a ā€œblurpleā€ light which have a reddish bluish purple light, cheap and ineffective ---
**Author:** ![TommyBahama](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@TommyBahama](https://ilgmforum.com/u/TommyBahama)\ **Post date:** [February 13, 2020, 2:05am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/11 "2020-02-13T02:05:27Z")
> [@Nicky](#): > > Why did you recommend MH over CMH? CMH would first require a mogul base adapter and Iā€™m not sure how well it would work with an unmatched ballast, if at all. MH is great for veg and HPS is great for flower. Thereā€™s no need to complicate it more than that. ---
**Author:** ![TommyBahama](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@TommyBahama](https://ilgmforum.com/u/TommyBahama)\ **Post date:** [February 13, 2020, 2:24am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/12 "2020-02-13T02:24:44Z")
I did a quick search and it appears that while technically you could use a CMH bulb and mogul adapter with a standard HID ballast and fixture, the efficiency and lifespan would go down significantly as CMH is low frequency and MH/HPS are high frequency. ---
**Author:** ![Nicky](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/nicky/32/397422_2.png) [@Nicky](https://ilgmforum.com/u/Nicky)\ **Post date:** [February 13, 2020, 2:36am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/13 "2020-02-13T02:36:56Z")
CMH to my understanding is much better than MH sooo thatā€™s why I ask. Any other opinions? @Myfriendis410 @PurpNGold74 @dbrn32 @WickedAle @AAA @BobbyDigital @peachfuzz @Covertgrower @Gremmall @MattyBear ---
**Author:** ![Covertgrower](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/covertgrower/32/423081_2.png) [@Covertgrower](https://ilgmforum.com/u/Covertgrower)\ **Post date:** [February 13, 2020, 2:37am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/14 "2020-02-13T02:37:58Z")
I would prefer CMH, because it is true spectrum, and you donā€™t have to switch when flowering. I still prefer LEDā€¦ #cobnugs @Nicky ---
**Author:** ![TommyBahama](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@TommyBahama](https://ilgmforum.com/u/TommyBahama)\ **Post date:** [February 13, 2020, 2:38am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/15 "2020-02-13T02:38:36Z")
The poster asked about HPS. For all intents and purposes, CMH is not compatible. MH and HPS both work in the same fixture. I would choose CMH over HID, but thatā€™s not the information @LMP1 was asking for. ---
**Author:** ![Nicky](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/nicky/32/397422_2.png) [@Nicky](https://ilgmforum.com/u/Nicky)\ **Post date:** [February 13, 2020, 2:38am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/16 "2020-02-13T02:38:39Z")
Oh I far prefer LEDā€™s as well ---
**Author:** ![dbrn32](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/dbrn32/32/533801_2.png) [@dbrn32](https://ilgmforum.com/u/dbrn32)\ **Post date:** [February 13, 2020, 3:14am UTC](https://ilgmforum.com/t/help-please-first-time-set-up/39987/17 "2020-02-13T03:14:11Z")
I agree, wouldnā€™t mix cmh bulb on ballast designed for the others. Imo air cooled 600 is hps rig of choice in 1mĀ²