Jian Yang,
There's a reason why, despite the limitations of the built-in flash, that I choose to stick with it.
Different light source emits varying range in the color spectrum, ie. different color temperatures, which is what you're observing with the PL light. If it turns out yellow, it's probably a "Warm White" bulb. Blue, if "Cool White".
Even natural light have varying temps, depending on which time of the day the pics were taken, ie. dawn, mid-day or dusk (from warm to cool color range).
You can customize the 'white balance' settings for your 'studio sessions', when using PL.
But until I can afford a fully-spec'ed digital SLR with hot-shoe mounting (so that I can fiddle with off-camera flash), I'll make the best of what I have.
I'm back & keeping 'em fingers wet,
Ronnie Lee
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