J.F. mentioned the color change for these EL displays with increasing frequency. I decided to test it, and used sgen Linux signal generator, and my audio power amp. Power amp directly does not do much, not much peak to peak output voltage, you can see something, but not bright. So I added a small 1:10 audio step up transformer.
Started at 22kHz, -> blue
10kHz blue
8 kHz green blue-blue and then lower more greenish.
While switching between frequencies (wanted to try a sweep actually), the amplitude got a bit above what the EL strip could handle, and flashover happened. No way to restore, not even after cutting a piece off, flashover at where the connections are.
Next got an other one and measured capacitance:
109.045 nF Now that was a surprise, I expected some pF, maybe a nF, but not a hundred nF. So driving it in resonance seems the way to save energy. The blue color shift seems to come from increased current at higher frequencies?
OK, learned something.