Look at this situation, you must be raising something. I don’t know the temperatures of the glass and wick of the lamp, but I can give you a rough idea: the surface temperature of a 40-watt lamp may be close to 100°C, and the temperature of the wick may be several thousand°C?
The purpose of my answer is mainly to say that the lamp glass cannot come into contact with things. For example, the temperature will accumulate and increase after being wrapped by things. Then it is not a matter of 100°C, but how many hundreds of degrees? I don’t know if incandescent light bulbs of 40 watts or above can cause fires if they are wrapped and come into contact with something.
For a 30X20cm box, at this room temperature, I estimate that the surrounding temperature close to the bulb is close to 40 degrees, and the temperature far away from the bulb should be much lower, and the temperature difference is not small. It may also depend on the insulation capabilities of your box.
The main purpose of my answer to this question is to say: Be careful of electric shock and pay attention to safety! The light bulb must be fixed firmly to ensure that it is foolproof and cannot come into contact with things. Because the lamp base and holder of the light bulb are very hot! The material of the lamp holder and the material used to fix the lamp holder must be resistant to high temperatures and not deform.