I finally got some time to dig into the exact lights I tried from M4 and the lights I've been using, and currently still use, from eBay.
First, the light below from M4 is what I bought to ideally replace my eBay lights that I'm running throughout the coach.
http://www.m4products.com/g4-18-563...g-5630-leds-side-pins-to-replace-20w-halogen/
The above lights are "rated" at 600 Lumens and 3200 Color Kelvin.
Below is the link to the eBay lights I originally purchased and am still using. They are rated at only 310 Lumens and Color Temperature of 2900-3500K.
http://www.ebay.com/itm/181150657436?_trksid=p2059210.m2749.l2649&ssPageName=STRK:MEBIDX:IT
I can understand the eBay lights might have a different color than the M4 lights, the eBay lights much more closely match regular incandescent lights in my opinion. But the advertised light output of the M4 lights is nearly twice that of the eBay lights. It's painfully obvious they are not even close, the eBay lights are much brighter. I also tried several of the M4 lights before coming to this conclusion hoping it was a dud, same result. Unfortunately by opening them all I can't really return them. Need to consult M4 about this as they weren't cheap.
As for the other M4 lights I've tried. The ones below were my shot at brightening up the office.
http://www.m4products.com/cob04-cw-cool-white-elite-series-super-bright-cob-led-plate/
Once again they are rated at 525-550 Lumens. This should be very bright. Well they aren't. My eBay lights from last year shown below and rated at about 432 Lumens (18LM per LED, 24 5050 LEDs per board) are still brighter than the M4 LEDs.
Not trying to pick on M4 as I do need to talk to them about this. Also keep in mind eBay marketing is not an exact science as these come direct from China (literally). But I tend to believe that if anything sellers on eBay are going to over-rate everything as that's the business environment they work in.