A darker color like this would fax better, but most fax machines are pretty good with grayscale nowadays. I can provide a black and white or darker gray version no matter what color version you want to go with.
The design definitely says "lighting" which is cool. I am kind of torn with the abstract on my current #1. I like it and it says NH, but not much about lighting.
I like 475 because we are also into Audio Video. If I can incorporate AV, Home Controls, Lighting and all the stuff we do into visual imagery, that would be kind of cool.
Well the 2 shapes were meant to represent the negative space in an "N", but they could also be an A and a V. The up and down arrow aspect of the shapes represent controls. I initially meant it for light, but could also work for volume and channels.