Not meaning to rebut any of your post with this response. I'm highly suspicious of the 1600 lumen claim based on what I see for LED light bulbs in the store. The lights you got claim "over" 1600 lumens on 2.8 watts actual input power, or 571 lumens per watt. The "60 watt" LED bulbs on the store shelf claim about 800 lumens on 9.5 watts, or 84 lumens per watt. That's a 6.8x difference in efficacy. Doesn't mean these aren't good lights, it's just when something is this obviously out-of-whack, I wonder what else is? (One source I read says the theoretical maximum efficacy for white LEDs is a bit over 300 lumens/watt, so how did they calculate something higher?).
