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blue-dreamer
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Are dual arc bulbs better than HPS bulbs? 1000watters?
so ur running 7000watts of light? How do u run that much without worrying about electric company?
The big problem with dual-arc bulbs is that the mh portion ages much faster than the hps element. At the price they charge for these, you'd be much better off just pairing up individual bulbs and retiring them as they pass peak output.
I thought I read some threads that said the dual-arcs have problems with digital ballasts. Is this still true?
I did a run with straight hortilux dual arc and the a straight run with hps this is what i came up wit there very crystaly but the yield wasnt there when it went on the scale wit the dual arcs then wit the hps wasnt as crystly but i was happy at the end.......
tree,
how did u figure this out,
is there something u can link to explain that or do you believe that mh lamps go out sooner than hps
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halides in general have a wave shift at 200 hours and are the fastest and steadiest in lumen depreciation of any of the HID lamps. From initial strike any MH will be @ 70% lumen output within 10,000 hrs. But along that 10,000 hours is a steady drop off in lumen output.
check it for yourself with a light meter as you measure day one levels then check those same levels every 1000 hours. On a 12/12 that means take the readings monthly to see what I mean. By 6 months on a 12/12 you've lost 20% of the lumen output.
If you're noticing a drop off in veg as the lamps age after 6 months use, the halides output can be why.
I respect skepticism. In fact it wasn't until I performed the 1000 hour test for myself that I noticed that the drop off in umole count or lumen output, depending on your meter, was so rapid.Where did you get your information? I'm all for factual data, just cite references for us skeptics... ;)
If true, it makes me wonder what the lumen depreciation numbers are for HPS, as well.
At 18 hours/ day of veg then, a full year is 6570 hours, roughly 2/3 of 10K hours. If lumen depreciation is linear (where would one go to find that information?) then one could guess 20% lumen depreciation in a year?