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What's really funny; is the OP's title says Metal Halide - well - it says "MH".

I've been at this a long time and that's a new one on me! I guess you really do learn something new every day.

That ballast you show is for a "Sodium Vapor" lamp (whatever that is), or, a Halogen lamp. Neither one is any good for growing. What you need is a ballast for a "High Pressure Sodium" lamp.

Not bad at all! But I would still like to get some input on the "2 to 1 Ratio" question.

From what I understand - LED's don't do that well at flowering - I could be wrong; maybe they have improved lately.

Yeah, I understand; that's why I want to start small (and cheap). With 1 each MH and HPS magnetic ballast kits and 1 switchable electronic ballast, in the 250 watt range.

I am familiar with the "2 to 1 Ratio" concept - that is - 2 metal halide lights + 1 high pressure sodium light (all of the same wattage) for the veg cycle; then switching to 2 high pressure sodium lights and 1 metal halide light for flowering. This is supposed to provide the "best" spectrum...

You are right PW, that's exactly what it is my freind! I imagine it's salmon and whatever else they caught that day - but what the Hell (right). I use both kinds of Alaska Fish Emulsion + 2 kinds of Bat Guano to "coax" my otherwise "nuetral" and "mild" nutrients between Veg and Flower. Let me...

Far Red Light has an effect on the rate of photosynthesis. The wole explaination is rather technical (meaning I forgot!) - but much more important, in my humble opinion, is that Far Red Light can and does produce "The Emerson Effect". I will define it breifely, but you should google it to get...

That link you provided was quite interesting; they claim that this method increases the potentcy dramatically. Do you find that to be true? If that's the case: why doesn't everybody dry and cure this way? It (almost) sounds too good to be true. That article was three years old, I would think...

What am I looking at? They look like dried up turds! To be honest, I've never heard of this Malowi whatever it is. It appears that the buds have been compressed together and allowed to dry/cure that way (in a sort of a brick) - then broken apart in chunks. If I'm right; it seems like an open...

I'm aware this thread is a little old, but nobody really addressed the OP's question about Bat Guano. There are essentially two kinds of Bat Guano; it depnds on the diet that is consumed by that species of bat. Mexican Freetail bats (and most all American species) are "Insect Eaters"...

Yes. It's called "Guppyponics". Google it.

Ain't that the truth!

That would have been my first choice too, but they are only available in 250 watt size or bigger. Too big for what I am doing, I'm using a combination of three 150 watt lights.

It's not the ceramic socket I'm worried about. MH and HPS lights use a different type of ballast.

I want to take a simple HPS growlight and add an MH ballast and a couple of dpdt switches. One switch for the power; the other one for the lamps (which will be changed). I'm not worried about the power switch; but the ballast puts out a "Starting Pulse" of like 4 or 5 thousand volts. I'm no...

Sounds to me like you're just over waterng! What makes you think that you need to water twice a day? How much water do you add? how much run-off do you get? Does the pot feel very light weight before watering? If you're only adding a quart or so at a time - you are definately over watering...

I think the reason some people are concerned that clones will eventually "lose something", or deteriorate over time, is because of the way they percieve clones in the first place. As stated above, clones are thought of as "an EXACT replica", or in other cases the cloning process is thought of...