After reading this thread, and as a newb to tanks, I would just like to say that as a hobby, I think we need to concentrate on making rules or requirements that will work for our battle units, but not prevent or discourage someone from participating because their battle unit is not quite right. I have 3 HL tanks equipped with DBC's and I enjoy them. I would love to make the trip out to Danville or other club some weekend, but I don't think I would enjoy participating if I thought that my tanks may have issues that would offend others because it wasn't a TBU. The fun goes out the door when things get too technical, then the only ones participating are the die hards. This is a problem in other competitive RC hobbies as well (I could give a good example of this, but I won't
I would say there needs to be a standard such as Tamiya to follow, but all battle units need to be set up to those standards and requirements the best they can. Look at RC racing, you can only do so much to make sure every car is equal to make the race fair, but we all know they aren't.
In today's economy, trying to tell someone that they have to have a Tamiya tank and battle unit in order to participate would only decrease their lack of interest in RC tanks. Tamiya tanks are awesome, but they are not for everyone due to price. It is all about having fun, and you can have fun with a cheap HL or an expensive Tamiya tank.
Not sure about other battle units out there, but I think Dan has an awesome idea on his website for the DBC where he experimented with using a potentiometer to regulate the LED. Maybe all battle units should have IR outputs that could be tuned for different battle settings. I am using DBC's in my tanks, and the IR range is easily changed via a resistor. As suggested earlier, when you show up at a meet, you could setup a couple of targets, and you place your tank as far back as designated, and quickly tune your IR leds for that day. I don't know all the rules yet and am no expert at tanks, but in real life, different tanks would have different firing abilities, and that would be hard to deal with in our hobby.