Driving power LED modules in microsecond regime
I think you need to rethink your design.
Let's start with a White LED that can give you 1000 lm (which is unbelievably bright by the way) as a single component.
Cree make such a device: http://www.cree.com/led-components-and-modules/products/xlamp/discrete-directional/xlamp-xml
This is a single LED with a VF of about 3.1 V but to get to 1000 lm needs 3 A for a total dissipation of about 10 W.
There are other White LEDs that are arrays of chips which allow the drive voltage to be increased and the current decreased. However they are typically much larger devices and may not suit your application.
Another type of white LED that might suit is the Luxeon Flash LEDs: http://www.lumileds.com/products/flash-leds/luxeon-flash
These only go up to 500 lm (3.1 V @2 A) but you could use two of course.
As was mentioned in the comments, White LEDs tend to have a long delay when turning off due to the phosphor. So perhaps white LEDs are not the way to go. 

Perhaps a 30 W RGB, or 10 W Red, Green, Blue, Amber, Yellow, IR or UV array could be used to provide the light. These are physically much larger (up to 1" square) but might suit your needs. Look on Ebay and you will find lots of Chinese made LED bulbs at extremely low cost. From those you might be able to assemble a range of wavelengths to suit. One site I've used is here: http://www.ebay.com/itm/10W-20W-30W-50W-100W-White-Royal-Blue-RGB-IR-850-940nm-High-Power-LED-Chip-Light-/381732558246 

This guy has tables showing all the VFs for the various wavelengths and array sizes, for 10 W they fall into roughly two groups  5 - 7 V and 9 - 11 V.
If you can create a few adjustable (to let you calibrate your light output) constant current drivers, you could switch the low side of the different LEDs with just an FET for the rated current.