Well that may or may not have anything to do with it.
If you can see it and it's not falling apart, then it's not dead, so give it time. Anemones are very sensitive creatures and they need time to adjust to a new environment. This is a big problem with anemones, they can move, and the spot they decide they like may not be conducive to your viewing preferences.
A consequence of low light is bleaching (a radical lightening of color). That's what you really need to watch for when you have lower lighting.
With all due respect to all posters, it's not just about water quality. Corals (depending on the species) and ALL anemones except tube anemones are photosynthetic, requiring proper lighting to stimulate the growth of symbiotic zooxanthalle in their tissues, which give them their color and food. In the case of SPS, it's especially important because SPS get almost all of their food this way.
Remember, it's not just about survival, it's about thriving.