What is clearly evident is that there was something wrong with the original ceramic bulbs you were using. It sounds like the bulbs were flawed but there is also the possibility, albeit unlikely, that they were not appropriate for the socket and were not making full contact with the electrodes.
Your 75W red heating light globe will be giving out both invisible infrared radiation (IR) and visible red light, while a ceramic globe gives out only IR and no visible light. The CHE should therefore produce more heat for the same wattage compared to heat source that also gives out visible light.
Infrared is the radiation that transfers heat e.g. from the sun to earth. It is a broad spectrum of electromagnetic radiation with a wavelength just longer than the visible light spectrum. Like visible light, it passes through transparent materials, such as air and glass, and is absorbed by opaque materials, such as soil, skin etc. When absorbed, it causes the material to heat up. For example, if you are standing in the shade on a hot sunny day and move out into the sun, the heat you can feel in your skin is due to IR being absorbed by your skin.
Blue