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The Oyster team has added a new in-app reading feature called Lumin. It regulates the device’s lighting according to the amount of natural sunlight that the user is experiencing (taking into account both the location and time of day).

Readers will find that as the sun goes down, Lumin will reduce the blue light beaming out from the mobile and tablet screens. In its place, a warmer, softer amber light will be emitted.

Here’s more from the website: “Studies show that nighttime reading on devices that emit blue light can suppress our bodies’ production of melatonin, keeping us awake and making us less alert the next morning. Lumin reduces the blue light coming from your screen as the day turns into night.”

Oyster, the eBook subscription service that has been described as a Netflix for books, has hired Jeannie Mun as the company’s first CFO. The company has also hired Barry McCarthy, as a new advisor.

Mun comes to Oyster from advertising technology company MediaMath. “Jeannie’s not only an impressive and experienced executive—she’s also an enthusiastic Oyster reader herself,” explains the Oyster blog. “Recently, she’s been reading the Berenstain Bears on Oyster to her kids, and she used our travel selection to guide her on a last-minute trip to Panama in February.”

McCarthy previously served as the CFO of Netflix. He is also on the boards of Spotify, Rent the Runway, Chegg, Eventbrite, NatureBox and Wealthfront.