Yes, there is a tad bit of green undertone in simply white. It can become more obvious next to other whites in a room. Do you have other whites nearby? Do you have any greenery outside your window that is reflecting color off of your walls?

Playing around with lighting can help. I find that lower CRI numbers can sometimes tinge walls green.

How large of a sample did you use and did you move it all around the room to look at it in different positions and at different times of day?

What to do to solve the issue is dependent on what is causing the issue.

As Kendrah stated:

Yes, Simply White has the slightest green undertone, but not something most people will notice unless it is sitting next to a white with warmer undertones or a brighter, purer white.

It can also appear greener if there is light coming through a low-e window with a green tint or if there is greenery outside of the window that reflects on the walls.

Other issues that cause the color to appear more green is if it is a color match from another company - SW or Behr paint color matched to BM Simply White or even a BM Store that is using an older color system that wasn't calibrated well.

First step is determining what is going on.

Can you provide additional information.

What was painted Simply White? (Walls, Trim, Cabinets)

What colors are there in the room that were not painted Simply White (Walls, Trim, Cabinets) What brands and bases were used on each surface? (Benjamin Moore Aura or BM Regal Select, or SW Emerald . . . )

Where did you get the sample?

Does the sample match the painted surfaces?

Does the green only appear during the day with natural daylight, only at night with artificial lighting?

Do all surfaces have the green tone or just certain areas?

Thank you all for the responses. It looks green at all times of day. This on kitchen walls with dark woodwork. The windows were put in before I bought the house, probably in 2001 or so. Not sure if they have low E glass. There are shrubs outside the windows facing a driveway. I used the large peel and stick samples from Sampleize of several different whites and after looking at them different times of day I liked this one. I was NOT expecting the green cast. There are green tile counters. I have one new light fixture over a cabinet with LED lights (don't know the K value) and the paint looks white there. The other lights are older fluorescents under cabinets and an incandescent fixture over the table. The cabinet doors are yellow. I hope this helps.

Florescent lights often have a green spike. I have not seen that with incandescent, but if the LED you got is producing the color you want, I would try to replicate that with the other light sources. Especially since you are seeing the green tinge at night with only interior lighting.

You can usually find the K value and other information printed on the LED lightbulbs.

this one is a 2700 k bulb.

Pictures of the space may give us some more information. You could be getting some reflection from the countertops, but that should only be near the countertops. Your not seeing green because you have other competing whites. (Dark wood trim).

I don't think it is looking green due to the cabinets being yellower as you stated that the paint looks white where you have your new lighting and that is over a cabinet.

Whites are so difficult. There is so little color that it is hard to see even in decent size samples, but it can scream at you when you get a full wall painted.