Re: How much heat sink?
"I'm having a little problem with the 40 watt light bulb, which has a very thin glass enclosure that provides very little insulation to the filament, so obviously the temp. increase is felt much sooner."
It's just an example of the amount of heat that is generated at the junction in the SSR. Your statement tells me you know nothing of thermodynamics but I'll respond anyway. The heat is NOT felt any sooner. The best insulation is gas and glass. The element is what, maybe an inch from the inside glass surface? Imagine the temperature of the filament's surface glowing white hot! It's probably around 2500°F or more.
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