COB LED is better lighting effect,it is no dizzy, no uncomfortable glare, no zebra strips. When it light up, it looks smooth and like a lighting panel. Heatdissipation is good and easily manageable. Description: Voltage: 15-17V DC Current? 350mA Power?5W Lumin?280lm Emitting Color: Red Wave Band?620-630nm Total Diameter??28mm Luminous surface Diameter??20mm Great for making light sources for spotlight, led bulb, ceiling lamp,street lamp,landscape lamp,track lighting, tunnel light and so on. Advantage of COB : Less thermal resistance; Larger cooling for LED chips; Better light effect Package Includes: 2 x COB LED