Hi Dean.
Yep, after about 5-6 bulbs were turned on for any period of time, the converter fan would kick on. We had 6 LED lights already installed by the manufacturer, so we used those most of the time.
The replacement bulbs were very similar in color to the original incandescent bulbs. The first two bulbs we experimented with were very cold or blue in color. I didn't like them in the interior, but they were perfect in the FW basement.
All in all, we had three different incandescent bulbs installed. Two 1076 in glass fixtures over the center island. Four 1383 reading lamps, with two over the sofa and two over the bed. And finally, 38 921 bulbs in the typical RV light pucks.
My wife was reading one night and reached up to turn off the reading lamp when she was done. She accidently grazed the bulb and burned her finger. When I replace this 1383 bulbs with LEDs, you can leave them on for an extended period, and they do not get hot to the touch.
We purchased all our bulbs through Amazon too.
As for the heat in Tucson, we're outta here in a couple of weeks for a four month journey around the country, and hopefully, we'll encounter cooler temps.