But just barely. I'm posting a picture now because the Weekend Cook and Tell challenge at Serious Eats ends today, and I said that I was going to start lettuce to chase the winter veggie blues. I'd hoped they would be up by Monday, showing their two little cotyledons by today, but perhaps the 3 year old seed is pushing its limit. Sometimes as seed gets older it is technically viable, but may germinate more slowly and give plants that aren't as vigorous.
What you see is the little upside down u of the emerging stem, with the seed coat still partly submerged in the soil (looks like they could have been buried a little deeper). The soil will catch and hold the seed coat, allowing the green first leaves (cotyledons) to unfurl. Pictures of that when it happens.
The top picture shows how close I actually have the pot to the underside of the light (about 2 inches). The black panel is the exterior of the fixture's hood. The cool flourescents give some heat, so it's just as well the pot is in a cool room. There is greater intensity to the bulb toward the center, so that's where I have my little lettuce seedlings.
I'll show weekly pictures of this lettuce as it develops.