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What is the difference between C7 and C9 Christmas Bulbs? - Christmas Light Source Blog
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C7 LED E12 Twinkle MINLEON Retrofit Christmas Bulbs (100C7MSMDT) - Action Lighting™, Inc.
Wintergreen Lighting OptiCore C7 LED Blue Smooth/Opaque Christmas Light Bulbs (25-Pack) 74030 - The Home Depot
C7 LED Christmas Light Bulbs | Faceted – HLO Lighting
25-light C7 Warm White LED Christmas Lights (Non-removable bulbs), 8" – Christmas Light Source
Amazon.com: Holiday Lighting Outlet Faceted C7 Christmas Lights | Sun Warm White LED Light Bulbs Holiday Decoration | Warm Christmas Decor for Indoor & Outdoor Use | 2 SMD LEDs in Each