Light Up My Life With LEDGO
You may never be confronted with the same problem at 250Km/h but in case you are, have you thought of attaching one of the LEDGO LED light panels to the top of your digital camera? They run off standard AA batteries and Sony rechargeable Li-ion batteries. Those aren't included in the kit, but they do supply a hot-shoe mount and a set of colour-corrected diffusion panels to cope with different forms of ambient light.
You can do video easily because they are silent and stills because they are really bright. The adjustable dimmer in the back will let you match the level of illumination to perfection.
Only $ 145 for single panels and they are in stock now.