What's the different between SMD led downlight and COB ?
Cree vs COB LED Lights – What to Know | Lektron Lighting
Amazon.com: iPower Grow Full Spectrum with CREE COB and Adjustable Rope Hydroponics, 380W LED Light, Indoor Plants : Everything Else
Cree® XLamp® CMT LEDs Deliver up to 45 Percent Higher Lumen Density than Competition — LED professional - LED Lighting Technology, Application Magazine
Amare SolarPRO4 COB LED Grow Light – All Green Hydroponics
Comparing COB and SMD LED Work Lights: Features and Differences - Unilite - Portable LED Work Lights
Cree Launches Industry's Highest Efficacy 90 CRI COB LEDs — LED professional - LED Lighting Technology, Application Magazine