"is someone going to tell me you getsing a pound and a half to two poiunds off a 300w led thats supposed to be the same as a 1000w hps."

Yes, people REGULARLY pull 2g/w from LED grows. That means 300w dropping 600 grams, that's a pound and a quarter EASY.

Pinstripe's 2nd try: PC case + 22W LED - International Cannagraphic Magazine Forums - 22 watts, 38 grams. That's 1.727272 g/w. Assuming yield scaled linearly with power increase, a 300w panel in that person's hands should yield around 518 grams of bud.

Maybe 5 years ago LED wasn't worth it. Unless you attend every JEDEC conference you're going to be sadly out of date on your LED information - we've been getting 200% yields using LEDs with ALL sorts of crops, from wheat to strawberries, for the past three years already.

You can't measure a half-life of a diode, as alloys can't reliably have a half-life determiniation. The half-life only applies to pure elements in the chemical sense. Now if you're talking about SERVICE MAINTENANCE LIFE, 24/7 operation gives you 5-7 years. 18/6 about 10 years. 12/12 will get you from 10-15 years of service, and that is all dependent upon temperature control and humidity control.