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Sunshine on seed flats

I have a greenhouse and several bottom-heat mats where I' m starting (too)
many plants from seed.  The last few days have been very sunny and the
greenhouse temp goes up to around 80 deg.  After I have planted a flat full
of seeds and moistened it well, I put a clear plastic dome over all.  I
feel I need to keep the direct sun off of these flats as I know the seeds
will quickly cook.  Is a layer or two of newspaper good for keeping sun off
enough to prevent excessive heat build-up ?  Would shade cloth be better ? 
Some of the seeds need light to germinate.  Will these still get enough
light to do the job ?

BTW...Some seeds sown last week needed darkness for germination and I
placed those pots in a cardboard box, closed the lid, and checked them
daily for signs of germination.  Today I decided to look at some of these (
vinca in 4" pots) with a magnifying glass.  Nothing was visible to my naked
eye, but when looked at with the magnifying glass I found dozens had
produced radicles and will be fully up in no more than 1 more day.  I
brought these pots out of the box and they are sitting on growing benches
now.  Will today's bright sun be too much for these (almost) seedlings ?

One more question - Should I set the thermostat for the exhaust fan to,
say, 70 degrees to keep the greenhouse interior cooler at this time ?

Sonnie
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