zlacker

This review for the linked led strip is interesting:

This is a perfectly usable (and subjectively bright) LED strip, but beware, the specified lumens are a lie. My power meter reports a draw of 33W and another reviewer reports ~38.6W. The maximum efficiency of a 5730 SMD LED is ~110 lumens/watt, so this strip is outputting at most ~3630 lumens. Seller's description of "45-50LM" per LED would lead you to believe this can output 15000 lumens or ~454 lumens/watt. This is far outside the world record 200 lumens/watt bulbs and even outside the theoretical physical limit of 250–370 lm/W.

>>windsu+(OP)
I posted a little further investigation at http://meaningness.com/metablog/sad-light-lumens/comments#co...

> http://electronics.stackexchange.com/questions/51778/ suggests that these LED strips have to be overvolted and powered at multiple points, which might bring them closer to ~7000 lumens.

> I'm also going to try comparing the hkbayi Super Bright to LEDMO's strip with 600 LEDs: http://www.amazon.com/dp/B013C2U09S/

>>windsu+(OP)
I'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't uncommon to see `3W' bulbs claimed as outputting 500-600lm, which would place them at ~170-200lm/W. I was always disappointed with their brightness when I got them, until some googling revealed that, as a rough working figure, 80lm/W was more realistic. Once I started working on that basis, the bulbs I got were more in line with my expectations.

>>ivank+9
I have on of those Super Bright led strips in the kitchen and it is actually too bright for direct lighting uses. You end up with afterimages for minutes on end after just glancing in their general direction. Would recommend you only use these for indirect lighting applications.