I dunno, science maybe? I mostly mentioned the electricity savings and lower heat output.... you dont need to own either to know that 600 watts is going to save you money and heat over 1000 watts.... Sure I mentioned the 600 replacing a gavita, but again im just using science here. Sorry I cant SHOW that.
Yes, you can check my grows over on the microgrowery subreddit under the handle /u/skoomd1. Ive got 2 single ended 600w hps grows under my belt (though these were several years ago, i dont have any pictures but each time was a bit under a pound), 2 blurple grows under my belt, about to finish 1 grow under samsung strips, and just started another grow under samsung strips. You can also look in my signature.