I was wondering if anyone turns off their VHO when the MH come on and then turn them on again when the MH go off.

This is my first tank with VHO and MH. I noticed that the VHO make little difference to the MH.... so I was thinking that my VHO would last longer if I turned them off for the 8 hours that the MH are on.

BTW... I have 2-140w Super Atinic VHO and 2-250w SE XM 10ks