A day blade is a colored lightsaber blade that’s intended to be used in a bright environment (i.e. outside in the sun or in a brightly lit room). A day blade also conveys the lightsaber blade color without illuminating the saber’s LED.
Watch What is a day blade? (lightsaber terminology) on YouTube
This article features red day blade covers from CosplayCovers (or fire1st on eBay). Day blade covers function the same as day blades, the only different being the day blade covers slide over a standard blade. The day blade covers are red to match the color of the red LED in the Kylo Ren lightsaber. Standard lightsaber blades are white or silvery in appearance, so a standard blade doesn’t typically match the color of the saber hilt’s LED.
Day blades come in many different colors, depending on the company that’s selling the day blades. Saberforge, Vader’s Vault, and Kyberlight are some common day blade vendors (notably, Ultrasabers does not currently sell day blades). When choosing a day blade, you should select a blade color similar to your LED color.
Day blades are intended for environments with a lot of light. Standard blades look better in low light environments.
Flame blade covers on eBay from eBay seller fire1st [DISCLAIMER: This is an affiliate link]
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Do you have any day blades for your lightsabers? How do you compare your day blade to a standard blade?