Ok...after several false starts and re-calibrations (to D65), I think I have some useable numbers. On a 100" (diag) screen, I am measuring 554.65 Lumens. When multiplied by gain (1.25 FireHawk), that's giving me 693.32 or 23.38 FL. If you increase that number by 25% to factor in Helmholtz-Kohlrausch effect, it becomes 29.23 FL.
Frankly, I was expecting higher numbers, but given my screen size, it is more than enough. My meter took a spill, so I don't know if it sustained any damage. I intend to send it out for certification anyway. When it gets back I'll re-measure. Hopefully others will get an opportunity to measure this projector soon and we can establish an average.
I should probably add that my lens is a T1 (short throw). The T2 might give different results as it would have a narrower beam. My projector is about 14ft back from the screen, but I also took a measurement at about 4ft back using a tripod and white board and the numbers didn't change appreciably.
There is certainly enough light here to support larger screen sizes than mine -- particularly with materials having a modicum of gain. The fact that there will be no significant deterioration in output over time, is a big plus for me. And my grand kids get a big kick out of watching 3D movies.