Ceramic Metal Halide (CMH)

[big-ultimate]

yes
what do you think?

 

[rives]

I use (2) 315s adjacent to one another in separate hoods (4x4 tent) and it works great. I have no idea about the quality of those fixtures, their light control, footprint, etc, but the idea of using two lamps is solid.

 

[non]

looks like nice ready option if one is not too fond of diy. double papillion also seems cheaper than two single ones.

 

[The Fruitbat]

I have done as much research as I can stand. Someone tell me if all this is correct.

This bulb is the 315 that is doubled jacketed, 3100k, and open rated, right? http://www.lighting-spot.com/cdm-elite-mw-315-t12-930-u-o.html?fee=9&fep=7700

This PGZ18 socket is enclosed rated, but since the bulb will fit and is open rated, can safely be run without an enclosed fixture, bare and open, right?http://www.lightingsupply.com/smhk577a.aspx

Finally, will this ballast run the 315? The catalog number is the same, so it must drive the 210 and the 315, right? http://www.ballastdiscount.com/metal-halide/iztmh210315rlfm.html

Sorry for the the simple questions, but after reading this thread and trying to find distributors for two weeks, my brain is starting to hurt. I think this post will really help future noons like me, if someone in the know could confirm, deny, or clarify this info.

Thanks to anyone who will help, and to those who experimented to get all of this far.

 

[rives]

Yes, that is a double-jacketed 3100k, but it is not the Agro. The Agro part number is 41521-6. There are some earlier versions of the Agro that have a different (lower) last number, but the 41521 portion remains the same.

Yes, the double-jacket lamp can be run safely in a PGZ18 socket in an open fixture. The only problem is that it will also allow the use of a single-jacket lamp, which would be a very poor idea. The PGZX18 socket won't allow the PGZ18 lamp (single jacket) to be used, but they are very difficult to find.

Yes, that is the correct ballast and it looks like a damn good price.

 

[The Fruitbat]

Thank you rives! I will order these parts and report back.

 

[HorseBadoritiz]

I'm curious if anyone knows if there is a standard distance from a bulb to a meter that manufacturers use when determining spec'd lumens?

I just got a cheapo lumen/lux meter, and thought I might be able to use it to see how bad my bulbs are compared to new factory specs?

 

[The Fruitbat]

I am a total noob about this, but it seems the manufacturers take the reading to present the highest lumen output. This suggest that they take it from directly at the bulb.

If I were you, I would record three readings. One directly at the bulb, for optimal lumens, one at exactly 1 foot, for easy conversion to footcandles, and one where the light will actually hit, namely, your table, base of the plants, or top of your SCROG/SOG/whatever.

 

[noyd666]

or

http://www.hydrohobby.co.uk/630-watt-dimlux-expert-dual-cmh-lighting-system.html

spotted this for sale in aus this morning $1700 oz dollars cheap thought gavita was dear. I would like one of these for veg, keep the wattage down a bit.

 

[big-ultimate]

that has already try to type of bulb?
we do not have in France

 

[LargePrime]

that has already try to type of bulb?
we do not have in France

je suis incapable de comprendre.
s'il vous plaît essayer à nouveau
je ne parle français , désolé

via google translate

 

[Mikell]

Ah, good ol' Google Translate. Hated by everyone but the English

 

[rives]

I see that Welthink has a turnkey fixture available on eBay. Available in either 120v or 240v, with an Agro lamp included for a mere $550 with free shipping. It would be interesting to know how their ballasts perform with the 315 - their LED fixtures seem to be of reasonable quality.

http://www.ebay.com/itm/Philips-315...m-/281474366662?ssPageName=ADME:SS:SS:US:3160

 

[tenthirty]

I think that for that kind of money I would support Cycloptics.

 

[rives]

Yep, pretty steep. It looks like Welthink's design might take less headroom, though.

 

[big-ultimate]

je suis incapable de comprendre.
s'il vous plaît essayer à nouveau
je ne parle français , désolé

via google translate

remove a link was talking about a bulb 350 w, I do not dare put the link lol

* I'll try this lamp in November dual 315 w must be effective? https://www.growshoponline.nu/fr/vm...double-dpapillon-630w-greenpower-incl.-lampe/

 

[Luther Burbank]

Does anyone have input on 2x 315w's as opposed to one 860w for a 20sq.ft. grow tent? The 860 would be 41w/sqft, the two 315s a touch over 30w, but I figure the better light coverage might make up for it. Wondering if 3x 315s wouldn't be better or if it'd be overkill. Of couse 315s mean I'm gonna have to be figuring out the differences in those models. When I originally went CMH years ago it was partially because it was a cheap and very easy solution. These days it seems way more complicated and way more expensive. I really loved the old retro whites, but now I'm wondering if the extra cost justifies the new bulbs/ballasts. I'm gonna redig through the last few dozen pages again. Perhaps it's time for a CMH thread refresh as the original post is more than a little dated.

 

[Drek]

If it's the seller I'm thinking of, he had piles of those lamps and I guess they've all sold out!

315 would be an excellent solution, but you're looking at probably a thousand bucks for two complete setups, maybe more. You also need to offer the external transformer a 240v line unless it's otherwise wired for 120v by the OEM.

There is no PAR rating for the 860, but I'm guessing it's in around 1.6ppf/w minimum(860x1.6=1375umol). 315w puts out 1.9ppf/w(2x630x1.9=1200umol)of tailored spectrum for flowering/growth. Both lamps emit next to zero UVB, for increasing the amount by which you get blasted(supposedly).

Depends how much $$$ you wanna throw at it. There is a MH solution from Philips that looks good; the 4k lamp from Solistek and the Sunmaster 3200k as alternatives. Any of these lamps will work great as a single lamp solution imo.

 

[rives]

Does anyone have input on 2x 360w's as opposed to one 860w for a 20sq.ft. grow tent? The 860 would be 41w/sqft, the two 315s a touch over 30w, but I figure the better light coverage might make up for it. Wondering if 3x 315s wouldn't be better or if it'd be overkill.

Luther, I'm assuming that you mean (2) 315's and not two 360's, and that I'm not answering the wrong question!

I used (2) 315 T9 930's in my last Tsi Fly run, in a 4x4 tent (39w sq/ft). I only had 5 plants ready to go and to fully optimize the space, I could have run 4 more without having crowded them down very much. Even without filling the tent completely, I pulled .95 GPW.

If you can fit them in there, 3 of them would undoubtedly be even better but probably not necessary. The prices up above in Fruitbat's post #6544 are among the best that I've seen for retail pieces, but I would go with the Agro lamp rather than the standard 930.

More pictures in album -

 

[Luther Burbank]

Rives, thank you as always, and yes a bad typo on my end, I meant the 315s. I've dug 25 pages back this morning - would you mind summarizing the difference between the Agro and the Elites? I was looking at advancedtechlighting and it seems their combo would be the best way to jump back into the pond, but those come with the elites, right? I didn't catch if they were 930s or 940s. Also, are you running bare or hooded & vert or horizontal? I feel like such a newbie again, but it's been ages since I've actually been growing indoors.