LED COB Chip 3W 5W 7W 10WLED COB Chip. 10W 30-34V. Apply paste only very thinly heat conductive adhesive. for easy mounting of LED and other components on heat sinks. Light color (in Kelvin): warm white ~3000k-3500k, cool white ~6000k-6500k, nature white 3500-4200k.