Don Foreman wrote:

Roger that, though I thought highest photopic response was more
towards green.

Remember the yellow-green Picket & Eckel (sp?) slide rules of the late
'50s and 60's? That was the reason for the colour choice.

Karen said she wanted red, roger that too. I'm disinclined to argue
with females about color choices, YMMV... G

Wise man!! :-)

Ted