I guess what I meant was, what is the relative intensity in the center vs at the perimeter? I don't have a lux meter to test the effects of a lens.
O gotcha, while I am at it I will check the boost of the lens. Because the COBs are so high powered (53W), the distance to canopy will be large enough that the lenses make a HUGE difference.
From a distance of 16" from COB to test surface, with lenses, the lamp is lighting approx 30" wide X 18" tall or 3.75 ft² that is 28.5W/ft².
Without lenses:
center 19000 lux
north 6" from 17200 lux
west 6" from center 17000 lux
west 12" from center 12500 lux
west 15" from center 10000 lux
sw 12" from center 12000 lux
With lenses:
center 53500 lux (+281%)
north 6" from 36500 lux (+212%)
west 6" from center 33500 lux (+197%)
west 12" from center 21000 lux (+168%)
west 15" from center 10200 lux (+2%)
sw 12" from center 20000 lux (+166%)
![DSC08057a.jpg](/data/attachments/2451/2451403-3916b960b72e22d05fada0ae80ca6408.jpg)
I tried to get the camera to show the difference. In the second pic, the lens is removed from the COB on the right. The true color temps do not come across in the photo. The color temp of the bare COB is much cooler than the side with the lens. Almost like the lens converts the 4000K to a 3200-3500K.
![DSC08056a.jpg](/data/attachments/2451/2451398-14cf247ab4d448594b5500dea0c2ba31.jpg)