How many lumens does my 1000W tungsten outdoor lamp produce?

I have an outdoor floodlight (1000 watt/tungsten [halogen?]) that I'm going to experiment with for growing an indoor garden. I'm curious as to how many lumens this lamp produces? I tried googling it, but only came across low-watt tungstens/halogens (up to 500w) - couldn't find any info regarding this 1000W lamp. It runs at standard 110/120v by the way - not 230v.