vho + wh7
 

to get the correct light output from VHOs I must run these in series, assumingly like this: http://www.fulham.com/NewFiles/wire04.gif

however there are 4 wires on a wh7, a vho requires 3 red and 1 yellow..so in series 2 vhos should get 3 red one yellow, and 1 remaining red must be capped.

I'm assuming having all 4 wires running the bulbs causes extreme heat and melts the endcaps..is that what happened to you steve?

Re: vho + wh7
 

nope never happened to me, It was Brad that had the melt down, but it wasn't because of 4 wires it is because it was not wried using both pins on the yellow side of the bulb. so to much power going through one pin eventually caused it to fail and sense it had no where else to go overheated the other end.

I ran 4 wires for two years with out a problem.

Steve

I assume your running 48" 110W VHO's?

If so, you need a Work Horse 7 ballast to drive 2 of them.
The WH7 has 4 red wires. 2 go to each bulb (on one end). The yellow wire goes to the other end of each bulb.

True, but that doesn't operate the bulbs at full VHO, only HO. Which makes a $40 VHO bulb look like a sissy against a $5 philips bulb.

Re: vho + wh7
 

hey all jsut brand new to this site but came ehre jsut to speak with stircrazy hows that for special lol

i am going to be setting up a wh7 with 2 vho's and am trying to understand the correct way to wire this i found one of your posts on AP with the diagram and it looks like the key to this is to give each post of the endcap a lead out instead of looping them together and giving them one lead coming out i am i correct in what i am seeing in the diagram

and also regarding endcaps a lot of people i have heard of having problems with overheating issues it has been with Icecap endcaps is it possible that there very design feature is also there flaw with omstone style endcaps they are exposed giving the heat a chance to escape the icecaps being enclosed wouldnt they actually hold the heat more

thanks for any help and now that i know about this forum i might be around here more

:mrgreen:

Re: vho + wh7
 

Wow, welcome to the site.

Yes this is correct. If you use a jumper there is a chance it could work lose, fail ect. this would put all the current through one pin which is the cause I have seen of your next question.

the problem like I said is mostly from incorrect/short cut wiring. yes the enclosure also helps by raising the temp, but on its own this is not a problem. If for some reason the power is forced to use one pin then it will get hotter and from what I have seen on a couple bulbs it will eventually melt the pin and cause extreme heat build up in a localized area which seams to be enuf to melt the icecap end caps. I did simulate this on a old bulb at home and was able to get some good arcing while it was melting the pin then after this all that happened is the end filament got red hot as the power had no where to go.

Steve

wow i jsut finished reading the thread on RC concerning fires with endcaps and every single person has always said it was from an waterproof endcap that really scares the hell out of me a lot of people suggested soldering the wiring directly to the pins or using connectors. I think connectors are going to be the way to go the kind used when wiring up car stereos and other electronics. Now i jsut need to find a way to hold the bulbs in place i was thinking some pvc cut into short pieces and sliding the bulbs through these but doing it a way that there is one support ant each end and one in the middle jstu so that if i ever bumped one end it would not fall into the tank, anyone have any thoughts on this

So a wh7 will run 2 VHO bulbs then? Up to what wattage? Been thinking about changing over from pc to VHO. Invigor, where in Regina do you find a wh7 anyways?



Scott

I didn't, I bought it from aquaria.ca for $54.99. If you get one gimme a call and I'll help you wire it to do VHOs :D they don't have it listed on their site on how to do it. Also if you want some endcaps and vho bulbs I'll make ya a deal :) I've got 2 10000k uri's...they're pinkish but bring out incredible colors on the fish...they are absolutely vibrant with color. I originally bought the wh7 for t5s, but they sent the wrong endcaps and I decided to try the VHOs out just to say I did.

i'd avoid putting plastic near the ends of the bulbs, they get pretty hot. I don't really need the "waterproof" endcaps so I might drill some holes in it to release some heat so they don't overheat..I just like the security of holding the bulbs in place.

I've also noticed a lot of growth in my corals since i've installed the VHOs :)