I'd like to see some 250W hps plants myself, but doesn't seem like anyone uses them. Even if you only grow 2 plants...someone will comment on how you really need a 400w hps. I am not disagreeing, as it is common knowledge that more light is better, and if I could fit the sun in my closet and vent the heat, I would use that.
It isn't that I can't afford a 400w hps. The price difference is only $10-20. This is about efficiency for a smallish personal grow. Additional heat detracts from that efficiency.
The real question was for those growers who aren't interested in growing/flowering more than 4 plants at any one time. If 250hps can do 2-4 plants just fine, why then would I want to have to deal with getting rid of the additional heat of a 400w hps?
If you are saying that a 400w hps will double a plant size when grow a few plants...then ok.
I'd rather read posts on what people can/have done with 250hps, or techniques to maximize that amount of light, rather than comments on how much larger the light needs to be. After all, that isn't the topic of the thread.
We have enough threads on 400/600/1K hps lights.