I found an add on Newegg for a clone of the A1000 that said 20,000 lumen output. 
I can’t find that exact one now but this one is close… https://www.newegg.com/p/054-01DC-00043?Description=20000%20t6%20flashlight&cm_re=20000_t6_flashlight-*~~054-01DC-00043~~*-Product