The 18W CFL that is commonly used serves as the baseline comparison between eLED and CFL for brightness comparisons. Below is the light set up to test the brightness of the 18W CFL. The CFL is placed in this orientation to mimic the vertical down light casings like the one shown to the right.
The light metering device is placed 40cm away from the edge of the bulb.
The 18W brightness rating at 40cm is at 422 lux. Inside a down light casing will add approximately another 200 lux to this amount.
Now to compare with the eLED 2.5W bulb. Below is the same test set up as the 18W CFL.
The brightness measured is at 1169 lux. (approximately double the brightness of an 18W CFL when used in a vertical down light casing)
This eLED bulb has been conservatively rated brightness equivalent to 18W CFL and its penetrative power is best used for 11ft and below ceiling height.