At what temperature do conifer seedlings no longer need light.

I have some potted seedlings I'll be overwintering.

Some Tsuga c., a Thuja occidentalis, a Picea abies seedlings and a few rooted cuttings of the same genus and one juniper v.

I'll be keeping them in a very dark location.

When will they stop photosynthesizing or at least stop needing light during dormancy period?

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