It's a good question, but it doesn't work. The Single Photon Avalanche Diodes detect the photons. But they don't care about which photons they detect. So we put a very narrow filter over the SPAD array.
So we get a level of ambient - but only at 940nm. You could use it to detect sunlight as sunlight has a lot of 940nm in it. A better way to do it is buy an ambient light sensor. ST makes one - the VD6283. It will do a much better job of giving you the ambient light.
- john
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