IRE is really an analog unit that relates to voltage excursion. It's really a terrible unit because it does not directly relate to the image itself, but rather the signal. I along with some other, try to avoid using the IRE unit entirely, precisely because it's both a terrible unit and has become immensely confusing. If you're dealing with analog signals, use mV to describe the signal. If you're dealing with digital signals, use digital levels to describe that. If you are describing the image itself or the representation of the image itself, I use %. % is really the best in my opinion because it remains the same regardless of what is happening with the signal range. 0% is always going to be black and always going to be understood correctly as black when it's noted as 0%, regardless of whether the signal is digital video, or digital graphics, or analog with setup, or without, or just plain inaccurate analog, or whether the signal is made of peanut butter. It really doesn't matter because % relates directly to the image universally and what the image represents. IRE of course, well, just doesn't. But people think it does, and thus we have a mess. Which is why I try to completely avoid it wherever possible.
So I would say that it's an 80% pattern(assuming that's what it is, as it may not be, if it's an 80IRE pattern from say Avia/Avia PRO, it's not actually 80% it's actually like 78%, again because of this unfortunate IRE mess. The gap is much greater near black too, if you look at a 10% from DVE, and a 10IRE from Avia, the difference is pretty huge, Avia there is down to around 3%).
If you say that you're looking at 80IRE out from an HDMI, I mean, you're essentially saying that you're looking at some voltage value coming out from HDMI, which really is not coherent. I think most people can understand that you probably mean 80%, not actually 80IRE, but it's this mess that is unfortunate which is why IRE is a dead unit and thankfully missing from the newer test discs, including DVE.
