Originally posted by: BatmanNate
Originally posted by: jliechty
Talking about high intensity discharge lighting and growing things in closets... are you
sure those are pepper seeds you've got?
High pressure sodium lights might grow peppers well, but they do not put out much in the blue end of the spectrum (pukey yellow colored streetlights are HPS, BTW). Mercury vapor spectrum is very spikey, and supposedly not terribly beneficial to plants. Metal halide is more ballanced, and is what is often used for sensitive corals and plants in aquaria. Fluorescent is probably going to be your cheapest and coolest option, IMHO, but my experience is with plants underwater, not with hydroponics or anything like that, so wait for someone else who knows better before making any decisions.
Thanks for the info! I've seen MH used in aquariums before, and understand it is rather expensive. Flourescents with a timer will probably meet my needs for my "crop". I've seen so many different recommendations on soil, containers, and watering though. Does anyone know of any good places to buy small plants? (I really do mean peppers too, mods please don't lock my thread!

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There is nothing illegal about growing plants using MH and HPS lighting. That's sillyness.
I'm not familiar with peppers at all. Are they a short-day plant(ie: they need more darkness than light to initiate flowering)?
You don't want to use HPS for vegetative growth. It doesen't provide enough light in the blue spectrum to promote bushy growth, you'll end up with tall, spindly plants.
Your best bet is probably a Neutral(4000ºK) metal halide. It provides good levels of blues while also providing the reds needed for flowering.
4000ºK vs. 3000ºK
It goes all the way up to 6500ºK... Actually, there are higher.. 10,000ºK, but they are for aquariums & not very useful for horticulture.
Fluorescent can be a good choice, too. It just depends on how hardcore you want to be. It takes a lot of fluorescent lighting to even come close to a 400W MH, though. A good alternative is to use both. The more light the better. You can't have enough indoors; and nomatter how much you have, it won't compare to the sun.
The problem with MH/HPS lighting is that they generate quite a bit of heat. You need ventilation regardless, because plants need to breathe, but if you had a 400W unit or larger, you would definately need to start thinking about an intake/exhaust system. That's one area where fluorescent lights really excel. Plus, they don't suck the juice.
There are smaller wattage MH/HPS bulbs. Depending on how many peppers you want to grow and how big you want them to get, a single 250W MH bulb and fluorescent lighting mounted on the sides could be very effective.
A 400W MH bulb can produce 35 - 50,000 lumens(MH/HPS respectively) in a 2'x3' area. You would need 12-16 4' fluorescent tubes consuming 480 - 640 watts or more to match that ammount of light, but the light is spread out over a greater area.
The trick is throwing all this wattage into a closet and still maintaining an adequate environment for the plants to grow. Remember, you're trying to mimic outside. Temperature, humidity, etc all have to be right.
As for soil, I have no idea. You'll have to do some research on peppers to find out what kind of soil the kinds you're growing need. You're also going to need fertilizer, but use it at 1/4th the recommended dosage, especially on young plants.
Good luck!
