gtag('event', 'conversion', {'send_to': 'AW-972395556/RN4nCJnV4tkCEKSo1s8D'}); -->
BTW I have tried both VHOs and T5 and for my tank I like the actinic VHOs better.
For your light question can you possibly drop the t5 down in the hood or run them front to back (VHO or T5) with a smaller length bulb between the MH.
When your supps move to the outer edge (front & back) due to the MH reflectors, you will loose a lot of efficient lighting IMO.
Case in point, when I had my 4' 120g set up in LI with a stand & canopy, I was able to have two 110w URI actinics about 5" from the front and from the back. Tank was lit rather nicely and bright. Now that I moved the tank to CT and did a inwall jobby & utilized lumi mini stealths, the spread of the URIs are about an inch from the front and 2" in the back. While you can position the bulbs somewhat because of the internal reflectors, the lighting efficiency has dropped a good amount. I would say close to 30%.
IMO, if you utilize four 39w T5s, it would be even dimmer and a big disappointment unless you overdrive them with an IC ballast. Your T5 reflectors will get very funky if you have them too low to the water surface also.
1) VHOs
2) You will need supp lighting with your 10k as to not shock the inhabitants and also to keep your 750w of MH on less
3) I use IC with XM 10ks. Tried all the different 12k & 14ks and they are just too dim for me
4) I used to for years run the VHOs for 12 hrs and the MHs for 8 hours together. I now recently changed over to running my VHOs to 10 hours and the MHs to 6 hours. I shut down the VHOs 15 minutes after and before the MHs come on and off. With just the XMs on IC ballast, they are not yellow at all, very crisp white with a smootch of blue IMO.
Excellent, that is the type of info I am looking for.
Just to clarify... you have a total lighting period of 10 hours, with the VHOs off while the MH are on (except for 15 minutes of overlap on either end of the MH lighting period). So the VHO are on for 2 hours 15 minutes on either side of the 6 hours of MH.
The 660 is dimmable and controls upto 440 watts. The 430 is not dimmable and controls upto 320 watts. I think that's it, but maybe someone else can add more . . .
Joe
P.S. Thanks for the kudos![]()