I may be missing something here, but you're saying you have a battery pack fill of LiPo weighing somewhere around 10kg. Eeeep!
I may be missing on the maths here so perhaps somebody could correct me if I'm totally wrong here...
I think the 1000W HIDs run around 30V, so would draw around 34A.
Assuming you reconfigure the cells as 8S (strap 2 of the 4S1P packs together
http://www.hobbycity.com/hobbyking/...ame=Polyquest_XF_3700mAh_4S_45C_-_90C_Lipoly_ ) and you've got yourself near enough the voltage you need at 29.6V. 30A would be just over 8C, so you would be fine for about 7.5 mins at under 1kg of battery.
The battery packs I linked to are packing 54.76W each, so if you have 1000W I'm guessing you have the equivelent of about 18 of those packs for a total of 72 cells. Strap them up as 8S9P and you've got a pack packing a rather toasty 29.6V and packing around 33.3A ... now your 1000W HID is only pulling just over 1C and you have just over 1 hour runtime.
Downside ... not exactly easy to carry, and of course we've not allowed extra weight for any ballast etc. you might need to drive that HID.
Don't get your lumens and lux confused. The 100'000 lumen output is distributed over the area of the beam -in other words, lumens is a measure of the quantity of light, whereas lux is a measurement of light distributed over an area.
You can get a very rough approximation of lux at a distance by calculating the area of a sphere equal to your distance from the light. That makes some assumptions of perfect spherical output (non-existant, but not so wildly innacurate as not to be useful).
So for 1m
Areas of a sphere = 4*pi*radius^2
= 4*3.14*1*1 = 12.6 (1dp)
So 100'000 lumens / 12.6 = 7937 lux (ish)
At 10m...
Areas of a sphere = 4*pi*radius^2
= 4*3.14*(10*10) = 1256.7 (1dp)
So 100'000 lumens / 1256.7 = 79 lux (ish)
At 50m...
Areas of a sphere = 4*pi*radius^2
= 4*3.14*(50*50) = 94247.8 (1dp)
So 100'000 lumens / 94247.8 = 1 lux (ish)
At 100m...
Areas of a sphere = 4*pi*radius^2
= 4*3.14*(100*100) = 125663.7 (1dp)
So 100'000 lumens / 125663.7 = 0.8 lux (ish)
Food for thought no doubt.