I am performing an experiment in a lab, which requires taking time-lapse footage of some samples in an incubator oven. The oven does not have a built-in light source, so this question is about how to set up the lighting.
The set-up is as follows: the samples are arranged on a rack at the back of the incubator, which is not much bigger than a large kitchen oven - the inside is between about 40 and 60 centimetres in each dimension. The sample rack takes up basically the whole back wall of the oven, and we need it to be lit evenly. The samples are not photosensitive, but we need to get a decent image with the relatively cheap camera, and it's important to get good colour reproduction.
The oven door has a smallish double-glazed window, and we'll be photographing through the glass, using a webcam type of camera that has an optical zoom, taking still images periodically using a Raspberry Pi. The reason for shooting from outside is that the inside of the oven will be 80 celsius, so I worry about the ability of a camera to survive inside the oven in the long term. It would also put the lens a bit too close to the samples, making the ones at the edges hard to see even with a very wide lens, due to the perspective.
For lighting I guess we have two options:
Option 1: Lights outside the oven. This was our original plan. The idea is to put two diffusers (probably just white card) on either side of the oven, and aim directional lights at those, so that the reflected light illuminates the samples. However, from testing this it was quite hard to avoid glare from the double glazed window, or reflections of the camera itself. It was also harder than I imagined to light the whole sample rack evenly.
Option 2: Lights inside the oven. This seems ideal given the issues above - if we can set up the lights inside the oven itself then we can avoid reflections much more easily. However, I don't know if there is any light source that is suitable for this. It would need to be able to survive 80 degrees for a sustained period of time (likely upwards of a year), and it would also need to not give off much heat itself, or it will overheat the oven. It would also need to give off quite diffuse white light. As a more minor issue, the cable would be quite thin in order to be able to seal the door.
Given this, my questions are:
is option 2 feasible/sensible? If so, what kind of light source would work for this, and what's the best way to get the lighting nice and even in such a confined space?
if option 2 is not feasible, what's the best way to light the samples from outside the oven, while avoiding glare or reflections? (Is there a better way than the one I suggested?)
(Note: I don't have the dimensions of the oven or its window to hand, but I will edit them into the question later.)