I'm using http://newvegas.nexusmods.com/mods/39968//? but I'm having a problem with it. I cant seem to get the Hotkey to work. It's vanilla hotkey or one assign to it just doesnt do anything. I can equip it and use it as a item but just not hotkeyed.

First question is, do you have NVSE? And, are you using the NVSE Launcher?

If your unsure, in the game, open up the console and type getnvseversion

If all that is good, then have you tried to equip it and unholster the Flashlight like you would a gun? I don't think it lights up in your pants. That could be embarrassing.

Yes but I was launching my game via the 4gb launcher, will I still get the 4gb effect when launching via NVSE?

No, you have to use the 4GB laucher, and there are two of them. I think the latest supports NVSE and it is the only one where before there were two. Just use the console command, see if you have NVSE 2.0 running when you use the 4GB launcher. if not get the latest 4GB launcher from Silverlight.org and that should launch NVSE.

Of course, you know that you need Steam running before you use either launcher, or none of it will work.

Ok with running from 4GB launcher i ran the command and I got something like NVSE 2, which I assume that NVSE is recognized to be running in game. So I tried the hotkeys again and still nothing. I even went and opened up Steam on my Desktop to insure it was running (and it's not in offline mode) and still nothing. BUT I did make one other discovery. My Pipboy light doesnt work either. Unless I'm mistaken it should still work with the Pipboy Readius, right?

I've the 4GB launcher(the nvse version) and the hotkey is working for me. OP, just as a reminder, you need to unistall uHUD first. Install the Flashlight mod and then install uHUD.

Pretty sure I did, but I will do so again just to be sure.

Ok, bit of strangeness. My PB Light does work, but I have to pull it out first for the light to work. The FL still only works if I equip it first but using my hotkey ( Q ) will allow me to turn it off and cycle through it's strength. I thought the HK was supposed to allow me to straight equip it without having to actually equip it via vanilla HK or menu?

Strange indeed. I'm pretty sure something in your setup is doing something adverse since even your PB is acting up. Btw, I've the Mod Configuration Menu(MCM) and its settings menu has hotkey J for turning on/off the lights. The 8 key is for equipping/unequipping. I'm not having any issue whatsoever with the Flashligh or PB.