/usr/share/psychtoolbox-3/PsychRadiometric/QuantaToTrolands.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | function trolands = QuantaToTrolands(wl,quanta,S_vLambda,vLambda)
% trolands = QuantaToTrolands(wl,quanta,S_vLambda,vLambda)
%
% Convert from quanta (sec-1 deg-2) to to trolands for a
% monochromatic light.
%
% See W&S, p. 103.
%
% 8/15/96 dhb, abp Wrote the header.
% 8/22/96 dhb Wavelength should be in meters.
wls_vLambda = MakeItWls(S_vLambda);
index = find(wl == wls_vLambda);
trolands = (quanta/(wl*1e-9))*vLambda(index)*4.454e-13;
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