Ok, well I was hoping not to get into a long debate and Im not the techy of my group, but I will try and give you some references. 1W Leds are typically driven at 350mA and 3W are driven at 700mA. mA are the amount of amperage the item will draw in an hour. Why the Mfgs call 700mA drawing diodes 3W is unknown to me, especially when you consider its only 2x the par value as well.
An advertiser puts it like this: In the world of
LED Grow Lights, the most common LED chips are 1W and 3W diodes. The labeling of these diodes however, confuses most people as they expect the name of the product to match its power consumption. With LEDs however, this is not always the case. The wattage of a LED is determined by the amperage they are driven at, with 1W LEDs driven at 350mA, and 3W LEDs driven at 700mA. Despite the fact that 3W LEDs are driven at double the amperage of a 1W, and normally consume only 2W of actual power, LED manufacturers have labeled them a 3W. It’s easy to ask yourself “then why did LED manufacturers name these LEDs 3W instead of 2W?” Perhaps it is simply a marketing trick, or just a label meant to confuse us. Whatever the reason it is important to note that anything labeled a 3W LED, is by all intents and purposes a 2W LED.
How did I come to the conclusion that Advanced was running there 3W diodes at 700mA?? I called and asked them brother, maybe you can ask them why they dont provide that information on their website. Like I said, most Grow light Mfgs are running the diodes at the Mfg recommended mA for optimum rating.
Im not trying to avoid answering the question, and Im not a professor of electronics either, nor did I save all the information I have read. I try to be thorough but Im not a mad scientist with grant providers to prove my work too. Im was just saying that the questions you are asking me are better answered by reading them yourself and not having to deal with LED grown weed smoker such as myself
You can go to Mfg site like Cree's
http://cree.com/products/led_docs.asp to learn about Leds and power consumption and Pars, I hate to refer to Hydro-Grow again, but they do have a page on it that may explain it better.
http://www.hydrogrowled.com/Comparing-LEDs-W8.aspx you can then verify their statements by going to the LED Mfg of your choice website and hitting up their spec pages.