How to grow?

Ok, first of all, it does not state what color-temp the bulb has. Secondly, it is a Mercury Vapour bulb, which is the most inefficient lighting for growing there is. If I'm correct the MV bulbs produve more heat and less light in the right spectrum. A CFL does the opposite. You can get CFLs with a 100% PAR (Photosynthetically Active Radiation), plus you can choose the exact color-temp.

So, in that small space I would use CFLs. As easy to plug and use as the bulbs in the link you presented. How tall is your grow-space?

EDIT: All that info (I pulled of the net) about the average lumens/watt turned out to be false. Sorry about that. I'll try to fine the correct info including MV. Here is the average of the others (the real numbers)

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Vanlig Lyspare = regular incandecent bulb - LE (kompakt) = CFL - Lysror = Fluorecent tube, T5, etc.

 

Sorry man, I was a little high, and just pulled some numbers from the web. Should have done some thinking.
First of all... those numbers are rediculous.

The right figures are:

A typical 250 watt mercury vapor lamp will put out around 48 lumens per watt or 12,000 lumens total. My chart of specific brand bulbs show a 250w HPS with 133 lm/w, and a 250w MH with 76 lm/w. A 250w CFL has got 78 lm/w.

Link: High Pressure Sodium Vs. Mercury Vapor | eHow.com​

EDIT: That link (eHow) might be wrong though, since all the MV-bulbs I can find on 100bulbs.com, has a lm/w between 20 and 23. Piss poor efficiency, if you ask me. CFLs would def be the way to go IMO.

 

Yes, you can grow with them, and if used they are best for the veg period.

When you re-veg a cannabis plant, you simply leave some foiliage (bottom i fine) when harvesting, and put it under a 24/0 light regimen. Some people cut the rootball and it might have some benefits.

I am one of those people... After a week or so under 24/0, I moist the soil (or do it a day after watering, just not completely dry) then pull the entire rootball up from the pot. I take a clean bread-knife and cut off the bottom half. I already have the same size pot ready filled with fresh soil, half-way up. Then I simply place the half-size plant/rootball back into the pot. Now, the roots have more place to grow and new fresh soil with nutrition.

As for how effective it is, that would be debatable. I have only done it once, so I'm def not an expert. My experience was that the re-vegged plant grew much, much bushier. It certainly has something to do with the characteristics of this particular strain, but I'm sure it's growth pattern changed after harvest (and after the first confused period). It was perfect to take clones from though. All of them survived and rooted. Maybe this will be my new way of making mothers?

 

Well. the yeild I don't know of as of this moment... it's in the 4th week of fowering
This is my re-vegged Motavation, Magus Genetics.

It did take a long time before you could call it a plant in vegetative state, as any other seedling/clone with normal growth. At first the re-vegged plant will just do nothing. Well, it will seem like it's not doing anything for a weeks or so. I did not check the bud-development under 24/0, since I din't have any intention to harvest them. Over time they have been overgrown by normal, but very thick bush, and dried/died.
(I just removed some dead leaves and stuff today. I could feel the clusters of dried, yellow/brown "buds"). They were removed.

I would say that it took about two weeks before the new growth was normal, and at first is was slow. So to get this thick, amazing bush, that is perfect for mothers it took about 5 maybe 6 weeks. I have a log somewhere, I could find out the exact times and pics to go with.... maybe

So, I would say that the it would be perfect to re-veg a special plant that you like, and use it as a mother. It could give you 100 clones if you wanted it, plus its small, bushy and easy to trim.

PS: The cuting/trimming of the rootball might have played a role in the "altered" growth pattern after harvest.