As I was finding it difficult to gauge the bean colour wirh the default USB light, I supplemented the same with a table lamp with an LED bulb.
During the course of the roast the yellow stage just passed by and I failed to notice it at all. During my second stage, turned off the lamp for the initial few minutes ans then realized that the bean colour under the USB light was worlds apart from that under the extra light.
I figured it was due to the colour temperature of the bulb I was using. It is a 3000k warm light. I think a cool temperature bulb should be better.
Any thoughts on this?