I know its yalls opinion, but Im curious as to why everyone seems to think that VHOs are much more expensive than PC, IME PC is more expensive, especially when it comes to replacing the bulbs. Not to mention that fact that it takes more bulbs to light a tank with PCs vs VHO, for example a 55 would require at least 4 55-65 watt PCs, vs 2 48" VHOs. Im also pretty sure that VHOs run much cooler than PCs, of course I talking when the VHOs are run on an electronic ballast as are the PCs. I agree VHO bulbs will turn black on the ends if they are run on a tar ballast and not replaced after about 6 months, if not less, but on an electronic ballast they produce almost no heat, and only need replace about once a year. t really depends on the ballast, as with all lighting systems, not whether its PC, VHO, or MH.