Well, I do know a 70W PSMH lamp will NOT light in a 70W HPS fixture. the starters are very different from what i understand. If you could, just offer to install a MH light for her or ask her to sheild the light so it doesn't bother you. you have to remember, SHE might not liek the poor color rendering of MV. I know i don't like the color of clear MV for use outisde collector's purposes. I like light that properly registers colors (so my choice for HID lighting for use other than a collector's is MH (whether it be standard or PS)