I am looking to be able to heat a sample of material, typically less than 500mg and sitting in a fused silica sample holder about 10mm diameter. Wondering about using (say) a 5W LED with narrow emission angle. The overall sample chamber of the machine is quite small, so ideally I need a small source, possibly with a light pipe. I certainly do not want the thermal mass of something like a halogen bulb. So, the questions...
Does this seem feasible?
What type of LED (in terms of wavelength) is the most efficient?
Does wavelength matter in terms of heating the sample?
Now, I expect you to ask me what sort of temperature I want to get. The answer is "not sure", but probably 80 degC would be adequate. It is to drive off moisture.