I&#x27;ve come across the same sort of exaggeration on eBay when I was buying LED bulbs a year or two ago.  An awful lot of bulbs claim to be much, much brighter than they can possibly be; it wasn&#x27;t uncommon to see `3W&#x27; bulbs claimed as outputting 500-600lm, which would place them at ~170-200lm&#x2F;W.  I was always disappointed with their brightness when I got them, until some googling revealed that, as a rough working figure, 80lm&#x2F;W was more realistic.  Once I started working on that basis, the bulbs I got were more in line with my expectations.