Lights

24 inches = seedlings 18 inches = veg 12 inches = flowering. Yes, full strength the whole way.

Beware of phone apps. The sensors our phones have to view par doesn't take into count certain wave lengths. So your parr reading will be lower than your light may be. My manufacture provided me a parr chart for the light. If you can't find that i would do a broad search using chat gpt even to get an idea of what its capable. If that fails your only other way is to get a parr meter which can be pricey.

Get app tent buddy measure your par adjust accordingly

a me lo dicono le cime delle piante se l'apicale si incurva o non cresce alzo un po la lampada... in germinazione l'altezza è piu importante della potenza in pratica la prima settimana basterebbe una lampadina un po' piu potente di quelle normali la distanza la puoi anche vedere con l'allungamento del gambo se il gambo si allunga avvicina la luce ad un certo punto si ferma e quella è la distanza giusta

Depends on your output buddy. 400ppfd for seedlings. 4-600 for early veg 6-800 for later veg. And 800-1000+ ppfd without Co2. These are the nums you need to be hitting throughout your grow. Where you got your light. They should have a chart with similar numbers. And will tell you what %/height to have it set at As all lights are dif. But gen you want to be 45cm away. And with a 240w light. You shouldn't need to exceed 70% for your whole veg, "getting to that % gradually". Keeping 100% for flowering and dropping to a height of 20-30cm depending on your light.