I did this once with one plant and 4 others under 6400k, the one uses 2700k didnt look too happy but it started to turn heahtly looking after 2 weeks, but half the size, then when I put them in to flowering together, after 3 weeks still no sex shown, but other 4 were starting to flower all over the place, so I threw out the little one, works out well for me since I would have run out of space