Idiots guide to grow lights

Go on, embarrass yourself, post a pic , I haven't done mine yet. Good intention - road to hell, etc. I look at all the chillis growing and start to panic. They're not like the toms you can shove in anywhere there's room outdoors when there's too many. I may have to be ruthless and cull a few.
Under the light I have a very small tomato with it's first true leaf poking out.