BP Light 550 (DyLight 550 Equivalent) is a vibrant orange-to-red fluorochrome with better performance than other rhodamine derivatives, including Alexa Fluor™ 555, TRITC, and Cy3™ dye for fluorescent applications. The high water solubility of BP Light 550 means that a high dye-to-protein ratio can be attained without causing precipitation of the conjugates.