so, i'm going to need to replace all of the lighting in the bathroom. in addition to the 175 W bulb, it turns out that the two fixtures both have type j bulbs in them, of 100 W and 130 W, respectively. so, even taking that big bulb out still leaves me with over 200 W worth of lighting in the bathroom. it was over 400 W initially...and, together, this may have been the cause of the spikes....
i can't just put a bulb into those type j fixtures. i think i can order led replacements, but i'm running a test right now to see if it's cost effective.
i might also be able to get a better replacement for that 175 W bulb.
that will be the last thing to do in the bathroom....but i really want to get through august, first.