Because I use natural daylight for the "light" I don't use any artificial light because I want them to have a normal day/night cycle.But i saw that others use ceramic reptile heating lamp which only emits heat no light, would it be better? I am just currently using the 25watts but am concern that they will not be on a normal daylight. (Which is also one of my problem with my other 3months old chicken wherein they got used to light at night). My brooding cage is somewhat enclosed. Wherein if no light inside the cage then it is really dark.
You can use a ceramic bulb but you would still need to provide artificial light during the day if the ambient light isn't enough. So that might be a better choice if you want them to have a day/night cycle (so ceramic at night and regular light for day, or ceramic 24/7 with a light outside the brooder during day).