Best double ended HPSI have a good question for you. You have been using different style lights now for a good while, can you give us a 'run down" now on what lights you like best to least, quality to quantity, etc. ?
Least cmh
Cmh bulbs dont last for shit. The high output cmh create hot spots and just wont reach the edges. Seems like the 315s are great for 3x3 areas. The 630 is great for a 4x4.
The Cubs have been the least trouble free. They grow good weed but the plants always seem spindly and less bulkier than the hps.
No difference in resin production at all from one to the next. Resin and trich density is strain dependent. In my video you can see I have a 630 cmh and cobs on other end. No difference at all between those two lights. The Cubs and QBs will put out more par per watt but if the electric bill wasn't a concern I would go with the double ended hps. They can cover a 5x5 all day and put some serious meat on your plants.