Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H-atom is suitable for this purpose?

$[{\mathrm{R}}_{\mathrm{H}}=1\times {10}^5{\mathrm{cm}}^{-1},\mathrm{h}=6.6\times {10}^{-34}\mathrm{Js},\mathrm{c}=3\times {10}^8{\mathrm{ms}}^{-1}]$