Quote Originally Posted by Methyl3
First off all plants will ALWAYS do better with more light (lumens). Lumens equal more bud. 600 watts is not that big and you must consider how many plants you will have and how tall they will be. Unless you tie them down then it will be hard for effective light to get down towards the bottom parts of the plants if you go with a sativa strain. For this reason I would tend to go towards an Indica strain which stays shorter and bushier. It also usually have a shorter maturation time. Also, potency and yield are not always in a direct positive relationship. Some of the most potent bud does not give:thumbsup: high yields. Just like when buying MJ...do you want quanity or quality.

Maybe I should have made this a bit clearer. I'm an experienced grower looking for some very specific information - which plants will grow well at very high wattages.

Actually, a 600 watt lamp with a greenpower bulb ( the newest generation agricultural bulb from Philips, not street lightning like some people use ) _used just on under 1m2_ will give buttloads og light, much more than average. Sure 600 watts for a grow several square meters isn't a lot, but then again, I have several 600 watters. :-] Light usage schemes go something like this ( from memory ):

30.000 lumens/m2: Minimum for growing compact buds.
50.000-80.000: Ideal for most plants.

Above that you have diminishing returns on number of watts per m2, then you have a stage where plants are actually hurt by excessive light, and then you have a stage where you kill your plants from all the light ( try putting 0.3m2 of seedlings under a 1000 watter and see what happens ).

Grapefruit ( 90% sativa ) is only 8 weeks. I'm growing it now, and it looks good. Sure the bottom branches have small buds, but I cut most of them anyway. It's very practical for keeping airflow under the plants, I have an extra oscillating fan there. But yeah, I considered some more extreme sativas like Neville's Haze and Neville's Haze x Zamal, but they were just too long too flower.

s12fever:Your "mate's" plant look great, good luck!

So my question is which kinds of plants can profit from the levels of lumens that usually either hurt the plant or just don't give a lot of extra buds compared to more normal levels of light.

Some people say sativas because they grow in tropical areas, and they have the most light. However, a lot of indica's grow in mountainous areas where the sunlight is much more intense than at groundlevel. So really it's hard to tell.