Ok, first this is not personal. I'm not trying to insult or offend you, we have a disagreement. In most disagreements there is an inherent subjectiveness- which is just a way of saying there can be disagreements without one side being absolutely right or absolutely wrong. Welcome to the world.
I am not giving bad advice- in any venture taken, there are details to focus on and details not to focus on, because otherwise the important aspects are neglected for lesser aspects or aspect where you have no control. Focusing on something like this is a waste of effort due largely to the total amount of relevant details (like the actual format of the test, or logic games, or time). I'm not saying the test center choice is unimportant independently, but in relation to everything else any test taker must focus on it is not worth focusing on- the vast likelihood is that the OP will have a test center with desktop- so much so that s/he should not address it. Incidentally, while power outages are possible, do not worry about individual power grids, the vast likelihood is that there will be lights in the room- do not worry about something that is consequential, but you really can't control.
Let me explain my point with an analogy: something like the brain eating amoeba is nasty and horrible to think about and yes people do die from it (there was a recent outbreak in LA), however the likelihood of being infected is so remote and the control one actually has is so small, that from a rational perspective focusing on defending yourself from the parasite is wasteful. The same is true for being hit by an meteor or anything else where the control and risk outweigh the effort of what possibly can be done.
I'm not wrong, neither are you. We disagree on where and what merits time and effort in the face of overwhelming total aspects of the LSAT. How far do you think we should take this- is it important (meaning how much can actually be controlled and how much effort is really applied) to worry about sunlight coming through the window and where (in a valley, etc.) to set up a test center?
Its basic a basic opportunity cost analysis: what are you giving up to focus on something as amorphous as this?