/usr/share/psychtoolbox-3/PsychRadiometric/PowerToTrolands.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | function trolands = PowerToTrolands(wl,power,S_vLambda,vLambda)
% trolands = PowerToTrolands(wl,power,S_vLambda,vLambda)
%
% Convert from power (in watts/deg-2) to trolands for a
% monochromatic light. Wavelength specified in nm,
% vLambda should be CIE photopic luminosity function.
%
% See W&S, p. 103.
%
% 8/15/96 dhb, abp Wrote the header.
wls_vLambda = MakeItWls(S_vLambda);
index = find(wl == wls_vLambda);
trolands = power*vLambda(index)*2.242e12;
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