No, what I meant is the manufacturer will make a number of different models. I think you gave 3 models in your original post. The manufacturer has to pay a number of dollars to get the certification for a model certified to be intrinsically safe.
To save money the manufacturer may only send 1 model out of the range to be tested. In this case the other 2 models may have been built to the same standard and might be perfectly safe, but they do not have the certification to be used.
I didnt mean every single light had to be tested, only the model.

Also I am speaking from experience in Australia. Some of the standard you use in the US dont translate to our standards so things have to be retested for ours.

Another example which has nothing to do with flashlights.
One of my friends used to work for Caterpillar as a mechanic.
He bought some Caterpillar brand work boots with steel caps.
After using them for a while he found out that Caterpillar didnt submit their boot to the Australian standards testing. So with our Occupational Health Safety & Welfare laws, he was only able to wear boots that had passed the tests. He knew that the boots were as good as the boots he replaced them with, but he had no choice.
I think Caterpillar have now passed the tests, but 4 years ago they hadn't.

Also in response to "I just need to remember to remind my wife not to instinctively flip on the light switch on the way out of the dark room! "
I have friends who would think its cheaper than a divorce <img src="/images/graemlins/smile.gif" alt="" />