no sir, not by a long shot! This type of generalazation can confuse people, so lets set a couple things straight. I was attempting to minimize the possibility of an informational overload, but I like where this is going :fechten2::mrgreen:
dont forget to factor in the losses in the ballasts, and conversion to heat. if you have a more efficient ballast, and use more fans, you could end up using just as much wall power as a system with a less efficient ballast, and fewer fans.(though this is logically backwards cause a less efficient ballast would produce more heat that would need to be dissapated. One, typically, could uprgrade to a more efficient ballast; secondly, I merely gave the "Oddyssea Fixture" as an example of design not as a model of efficiency. You are absolutely correct.
further more, to measure light output in WATTS is a mistake. we all do it, i'm guilty as well, but technically speaking, watts is a unit of power, not light. light is measured in lumens and candle power. That was something I was trying to not get into, as I wasn't attempting to explain lumes to watts, I was merely stating that using watts is using watts as, yes, using watts does not mean producing lumens by any extent. Furthermore, most lighting discussions I have read discuss the ussage of watts per gallon but do not specify how many lumens per gallon which would actually be more useful as then one could more easily make comparisons to lighting systems.
for the average person, the easiest way to know the true power usage of a device, would be to get something like a kill-a-watt meter, and compare the 2. That's if they want to purchase a kill-a-watt meter and both devices in order to test both devices and their entire systems; plus one should also be testing lumen output at this time to make sure that a similar and consist lumen output is being achieved by both.
something like a MH produces lots of heat, so depending on the rest of that particular system's efficiencies, it may or may not be overall more efficient than a flourescent system of equal LIGHT output. true, no arugment; however, in this case we are also attempting to conserve space, and, typically, a system can be upgraded/retro-fitted to be more efficient.
not to mention that you would also have to factor in the hvac system where the lights are as well, if you add 1000W of MH light, its going to have more of an impact on your airconditioning than a flourescent system with equal input power. Also a good point, but then one could also argue that this would have the reverse benefit in the winter.
conservation of energy, no energy can be lost, only converted. Well said