Very good points, Bill!
Seems to me that the legacy fixtures have the same heat problems as the new ones, just that the new ones have the disclaimer label attached now (probably due to Manufacturers being sued for house fires!).
The potential hazard is, and always has been present, when a fixture incorporates a Medium Based Screw Shell.
150 Watt lamps can be easily installed to them, and even some 250 Watt "sun lamps".
120-130 VAC Medium Based Incandescent Lamps rated 0-150 Watts (some upto 250 Watts) come in commonly used Lamp packages, such as "A", "R", "ER", "PAR" and "T".
Some reflect heat away better than others.
Nevertheless, with so many various power ratings and packages available to the consumer, replacing a failed lamp with "Anything That Fits" becomes normal operating procedure.
There have been disclaimer notes on older fixtures - circa mid 1970's - which state lamp wattage maximum and package type. That may have been their "Transition" period into the 90°C minimum wire rating disclaimers.
Any one else got some input?
Scott35
