What are the differences between the two Fancier 500 LED Panels

The first one cannot INPUT from a 12 VDC is probably what you mean. Yes it seems that way as the input is from an AC mains and the step down transformer to the lower operating DC voltage in inside the unit. Why they do this is most likely that the intended use of the light is indoors/studio or
near AC outlets. The second unit I see has a 4 pin DC input XLR as most pro gear DC input have. If it is the same light, I would opt for the second one as you never may know in what circumstances you may need it. You can always get a AC to DC adapter (everywhere on eBay) if one isn't included, check the polarity, usually 2 pins of the 4 are used . Make sure the max input voltage is not exceeded. It is usually given on the specs or written next to the DC input.
 
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