I was trying to edit my response and deleted , sorry bout that, electric savings i use like 450 watts to see a comparable yield to my 600w hps, i use mostly cree older series so i could upgrade and use less, as for heat , lighting sources doesnt really matter 450w of any light is 450w of heat, i still need to exhaust and deal with it, yield wise i think LEDs are the best but for quality i think CMH is the best.
If i could start over and had an unlimited budget i'd probably go with all DE HPS with DE MH between the lights, and build an out building with 12 foot tall ceilings in my back yard , a smartbee controller, and mini split HVAC system (i can't afford that right now but i been planning on either building a green house or grow room outside)
Here's some pictures of some of my harvests, you can add me to IG if you want to
https://www.instagram.com/p/BTkwC7KDY57/?taken-by=colorado4weed2love0
https://www.instagram.com/p/BVSigmzjeex/?taken-by=colorado4weed2love0
https://www.instagram.com/p/BVSiWejD3Wa/?taken-by=colorado4weed2love0
https://www.instagram.com/p/BU2U3BXDolR/?taken-by=colorado4weed2love0
https://www.instagram.com/p/BUqVOaqDBI_/?taken-by=colorado4weed2love0
I only have LEDs in a 4x4 tent so i mostly grow with HPS lights , been adding some CMH and LEDs in my main grow room lately, this run i plan to do 2x 600w hps , and 2x 150w cree XTE LEDs