Clear or slightly diffused?

I will be starting the 'big sow' this weekend, pressing into use my four new sets of shelving; these are 5-tier, plastic shelves (remarkably sturdy), which have enough height to take seed trays with lids or even home-made 'tent' style covers made with some plastic sheeting that I have (I have tons more trays than I have lids), however I was wondering if I might be faster/easier to cover each 'cell' of the shelving with the plastic sheeting?

So, rather than having three or four trays on a shelf with individual sheeting/lids, simply seal each side of the shelving with a single sheet (taped on, so it can be opened for watering), with the result looking like a sort of mini poly tunnel?

The sheeting I have is currently diffuse, so whilst letting light through, it wouldn't necessarily be 'direct' - if I heat treat it, it should go crystal clear, but I am wondering if the slightly diffused light might actually be better?

 

They will be starting out sat at our French doors which gets full sun all afternoon, but then it is only March. I will get the shelves up and the seeds sown and go from there I think. Thanks @Anthony Rogers