Should also mention that the v3 generation of diodes overtook the HID world by quality of light. The new diode generation gives better light, more the plants can use.. and got more efficient
The next generation diodes should be not far out, we run on v3 for a few years now. It might be tempting to buy HID due to the prices a starter set costs. Eskom will have eaten that advantage within one growth! Plus HID need globe replacement about all 6 month.. and those globes are not cheap.. is like Printers these days. Printer is 250 bugs.. a cartridge is 150 ^^
Go LED, costs less electricity to run, generates less heat and is the better light if you go v3. Is a win/win/win. I use my TS3000 from Mars for 3 years now.. The same in HID globes would have cost me double.. at least.