Hi buddy :-)
I would say it only makes sense if you add a CO2 system. However, this assumes that all parameters are 100% in the perfect range, since the high temperatures from the second lamp would not be bad with this system.
Before that, you should switch to Hydro or even better Aero. You also get better yields or do not need as much electricity as switching to a second lamp and CO2 system :-)
Hope I could help :-)