jonsnow399
Well-Known Member
This info if correct (and I don't see any reason to doubt it) puts to rest the idea that dimming a hid changes spectrum.
What happens to Spectrum when we dim our lights?
- Thread starter Evil-Mobo
- Start date
jonsnow399
Well-Known Member
a difference that makes no difference is no difference
wietefras
Well-Known Member
Well I saw a slightly bigger change with A Gavita Pro 1000W DE, but the spectral shift is insignificant yes.
If anything, the bigger issue is the loss in efficacy when dimming a HPS bulb that much.
jonsnow399
Well-Known Member
gavita claims that their 750 bulb can be dimmed to 600 watts with no loss of efficacy.
wietefras
Well-Known Member
Yes, but is that the same as 1000W to 600W?
Dim that 750W bulb to 450W and the efficacy will have dropped.
They also don't say that it's with "no loss of efficacy", but that it's still near 2,0umol/s/W at 600W. Of course it will still be slightly lower than at 750W.
jonsnow399
Well-Known Member
"We named it 6/750 DE FLEX because it is as efficient running on 600W as it is on 750W." Thats their advertising .
wietefras
Well-Known Member
Ah their marketing says it's so. Then it must be true
Just like all those blurple claims must be true?
Besides, they blatantly lie about the output of the "lamp" as well. It's not emitting 2umol/s/W. Probably more like 1.6umol/s/W.
Again, their actual specs don't claim it's at the same efficiency. Just that it's around this supposed 2umol/s/W both at 600W and 750W, but their 1000W fixture is also slightly more efficient at 1150W over 1000W It's obvious that the same goes for their 750W fixture. Going by the difference on the 1000W model it will be a 4% difference in efficacy between 600W and 825W. While at both wattage's it would still be rounded to 2.0umol/s/W for the bare bulb measurement.
So even if the specs and marketing are not 100% incorrect, 4% is still a decent difference.
a mongo frog
Well-Known Member
Ive found this to be true, but the complete opposite. Im not sure if your mean Gavita or if your talking DE bulbs, but i noticed on the Green power bulbs from Phillips powered by the nanolux ballasts that at the 1000 watt setting is throwing more of a red color and the 1200 watt setting in way more white maybe the blue you speak of.
What bulb were you running in your Gavita?
Evil-Mobo
Well-Known Member
I would like to know this as well if anyone has an answer based on solid info. My ballasts are not dimmable and all I use for HID is Hortilux stuff so..........
If I had the height thought the Gavita's would be a no brainer for what the fixture's cost but that's not the case for me
PSUAGRO.
Well-Known Member
Can run that ac/dc hood with de bulbs for height restricted, probably know that
..................hid, led are two different animals when it comes to dimming
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PSUAGRO.
Well-Known Member
I was thinking of the "TNT, it's dynamite" hood............all the rage in Australia
The Dawg
Well-Known Member
OneHitDone
Well-Known Member
Do you have any clue what the recommended distance to canopy is with the AC/DE hood?
Greengenes707
Well-Known Member
jonsnow399
Well-Known Member
No I don't necessarily believe anything a marketing or sales rep says that's why I'm asking here.Ah their marketing says it's so. Then it must be true
Just like all those blurple claims must be true?
Besides, they blatantly lie about the output of the "lamp" as well. It's not emitting 2umol/s/W. Probably more like 1.6umol/s/W.
Again, their actual specs don't claim it's at the same efficiency. Just that it's around this supposed 2umol/s/W both at 600W and 750W, but their 1000W fixture is also slightly more efficient at 1150W over 1000W It's obvious that the same goes for their 750W fixture. Going by the difference on the 1000W model it will be a 4% difference in efficacy between 600W and 825W. While at both wattage's it would still be rounded to 2.0umol/s/W for the bare bulb measurement.
So even if the specs and marketing are not 100% incorrect, 4% is still a decent difference.
CobKits
Well-Known Member
excellent info
are the wattages listed accurate or "nominal". in other words, due to voltage differences is it possible that "600W" could be 580 with one bulb and 630 with another?