How to compare the illuminance of similar light fixtures in Lux given at different distances?
You could do some back of the envelope calculations, if they're both the same shape and the LEDs in them have similar lenses etc., the beam will be similar, so the falloff will be similar.
Given that the area illuminated at 1m is 4 times the area illuminated at 0.5m (area of a segment of a sphere is proportional to the radius squared, so twice the distance squared is 4 times the area), the intensity of the first is going to be roughly ¼ that of the second. Which figures, going by the model number: the first is probably meant to be &quot;equivalent&quot; (these figures are always rubbery) to a 260W incandescent light and the second to a 1000W light, so roughly 4 times as powerful.
You could also compare the wattage to see exactly how much power each one is.
In cases where they're not similar size and distribution (BTW the first panel is less than half of the area of the second, so in no way would I say they're similar in size), then you're comparing apples with oranges. Different lights do different jobs.
TBH With cheapo lights like that I'd actually be more concerned about how good the colour was.