% \documentclass[onecolumn,a4paper]{article}
% \usepackage[english]{babel}
% \usepackage{amsmath}
% \newcommand[1]{{\mathversion{normal}$#1$}}
% \begin{document}
\begin{equation}
{{{light}}=e^{{-k\cdot {{LAI}}(l)}}}\nonumber
\end{equation}
% \end{document}
