Although Sansi gave me these lights for free to try, my review is honest and unbiased.
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I ran the 15-watt and 30-watt Sansi LEDs for 30 days and recorded a time-lapse. The 15-watt light seemed to perform much better than the 30 watt version (actual 23 watts). I think it’s because the LEDs on the 15-watt light are more focused, whereas the ones on the larger version are diffused.