Im with you now John. For veg, they seem fine, even assuming they perform half of what they claim (par rating). For zero dollars, I'd do it too. Could you improve on it? Sure, but if its working for you and growth rates are adequate, why change?
Flower is different. You're using 24kwh/day to flower with your hps, I pay about .15/kwh, which would cost me $3.60/day, $1314/yr. You could get the same output from a cob light for half the electrical usage. There is a variety of ways to go about it, but that amazon link will provide a small glimpse. You could splurge on high end cob light and pay for it in a year by lower electrical costs. Plus, your plants will explode. Its good you're checking out new tech