COB LED is multi chips packaged, it can 10 times more increase lighting area, so it avoid uncomfortable glare by the maximum extent.Opte Lighting uses small size of chips to make COB LED package (CREE Citizen).
By now, for small size chip, some famous LED chip manufacturer can reach 249lm/watt @ 20mA. But big size LED chip can only reach 161lm/watt @350mA. The light efficacy decrease when chip size is bigger. Also when LED driver increase current to LED, the light efficacy per watt is even low.The COB with small size chips will be a trend of LED light source package. Light spot holds the patent for invention for COB LED and lamp.