I bumped into this - a very handy comparison of all (I think) the Lightforce models

Lux Ratings Chart / Distance Reading Chart

Normal Lights
140 Lance 450M
170 Striker 650M
210 Genesis 800M
240 Blitz 900M
240 XGT 900M
HID Lights
140 Lance 35W 600M
170 Striker 35W 800M
210 Genesis 35W 1,050M
240 Blitz 35W 1,200M
240 XGT 35W 1,200M
170 Striker 50W 1,150M
210 Genesis 50W 1,350M
240 Blitz 50W 1,600M
240 XGT 50W 1,800M