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Depends on how the device has been designed really; Assuming they are inserted into the light touching each-other (i.e series) as to form a battery.. You could try getting a few CR2016's, they are half the height of the CR2032s. LEDs don't love being over volted, so you may very well damage them.
First try with 2x 16+1x 32. If it's not enough, try with 4x.
Lastly, consider a different light, coin cells don't drive white leds very well, or need constant replacement.
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