My HOT5s were not a loosing investment. I grew several grows with those lights and got some very nice buds and several jars that lasted me along time. And they were absolutely no trouble to grow with. Yes HPS will flower better,,which i covered in the post above,,,but HOT5s are not a loosing investment. Worst case is the tubes to flower with would be put aside once a different system was bought for flowering,,,but the HOT5 system is still the best for vegging,,again not a loosing investment.