Exciting Subject! Lampshade Wattage Limits

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All of the lampshades I have seen with both an incandescent and low energy lamp rating on them use the common 5:1 wattage comparison ratio. By this I mean it might state "Max 60W/Low Energy 12W" or "Max 40W/Low Energy 8W". One assumes that the wattage limit specified is chosen solely on the amount of localised heat the relevant lamp will produce and therefore the maximum amount of heat the shade can safely tolerate.
This puzzles me as I am sure that - for instance - a 60W normal lamp produces far more heat than a 12W low energy lamp does and so on in proportion. I wouldn't like to continually hold a 100W normal lamp but no such problem arises with a 20W low energy. Why then the seemingly unnecessary restriction on low energy lamp wattage?
Is there something painfully obvious that I’m missing?
 

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