The Natural Philosopher wrote:

What I want is low energy lamps with a BRIGHTENER!!!

Unless your whole house is lit with 100W lamps, just buy the next size
up - 4:1 is about right compared to normal pearl, 5:1 is relative to
soft tone. Of course if you want it to have warmed up by the time
you've taken your hand off the switch that's a different matter.

--
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