Interesting aside on LED did not realise the implications on Night Vision Gogles
Don't go stumbling around Shanghai at night with NVGs then. It's 10 p.m. here and I have just come back from a stroll down West Nanjing Road. It's about five miles long and a lot of it is a thousand foot high. It's like daylight at street level and everything, but everything, is lit up with LEDs.
You won't be able to stop at a red light either. They're also LEDs.