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Old 11-14-2006, 11:59 PM #21
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I'm also a first 4 weeks under MH, second 4 weeks under sodium grower. I've run pure halide start to finish and pure sodium start to finish and there is a small difference but like everyone has already said, not really a yeild difference. Currently, the halide for the first 4 weeks really controls the stretch and plant growth but the 400w sodium is my all time favorite bulb for flowering so I use it for the last 4 weeks. Something about the 400 sodium just gets the buds super sticky. The halide tends to make them a little more 'frosty' but the sodium makes them sticky, bigger trichs, more oily plant. If I had to choose one or the other, it would be sodium.
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Old 11-15-2006, 12:24 AM #22
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i seam to miss someone mentioning that HPS bulbs put out more lumins. i have a 1000wMH that gives 80000lums and when i put in ym 960w conversion bulb it gives me 125000 lumins, a good 45000 more. . . . my plants show grater growth because of the increase in lumins, . . . .
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Old 11-15-2006, 01:28 AM #23
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^^But plants don't use lumens...lumens are a way for humans to identify the amount of light. Plants "see" PAR watts - and a certain MH bulb called the Agrosun Gold produces more PAR watts than most HPS lights :wink:
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Old 11-15-2006, 02:48 AM #24
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thanks everyone for all the info...really good stuff
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Old 11-16-2006, 06:35 AM #25
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lumins is a name of a measurement for visabel light. the plant knows when it sees more light, right?? par, lumins watts. it dont matter more is more and less is less. im wondering why in my life YOUR the only one who has mentioned par wattage... i had to google it up myself.... so it looks like it has to do with wavelengths. my hortilux bulb has thoes wavelengths. it has to brand and quality, like usual...im laffing that none of my light packages has a par rating though...
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Old 11-16-2006, 06:41 AM #26
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Sounds like you're confused. "Lumens", and visible to human eyes, not plants. Unless your cultivar photosynthesizes through a pair of human eyes: "The lumen can be thought of casually as a measure of the total "amount" of visible light emitted." Visible to humans.

The PAR has to do with the wavelengths... yes... wavelengths usable for photosynthesis! What exactly does PAR stand for, anyways? Photosynthetically active, or alternatively available, radiation!
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Old 11-16-2006, 10:33 PM #27
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ahhh so par is that chart on the back of the boxes that show wavlengths... ?? the one on my hortilux bulb shows alot of blue for a hps....well nice to know that thing has a name!!!!
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Old 11-16-2006, 10:33 PM #28
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that also means that my 1000w mh is producing less usable energy to my plants as my 1000w hps??
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Old 11-17-2006, 01:30 AM #29
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no, PAR is Photosynthetically Active Radiation(wikipedia)


It's the light(radiation) that the plant can use (active) in photosynthesis (Photosynthetically). vs the light that your eyes can pick up (lumens).
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Old 11-17-2006, 01:39 AM #30
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That's what I said. It's alternatively worded as "Photosynthetically Available Radiation".
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