A few days ago I tried something. I've heard of people finishing flower with MH so I tried it. I changed out my DE HPS 2100k with my DE MH 6000k and was going to finish flower with it and keep it in there to veg the Sky Lotus next. Three days they ran under that light. Normally they each drink about a gallon a day, but under the MH bulb they didn't drink anything for the whole three days. I had to shut my dripper timer off.
Tonight I changed back to the HPS. I didn't want to, but I gave them three days to start drinking again and they wouldn't fall off the wagon.