Mh puts out less light at the same wattage as hps. Also under the blues in mh the plants do not stretch as muh so they have denser growth but tend to stay shorter while in veg under my because they stay compact. The reds in hps cause the internodes to stretch and elongate more than mh, causing the perception of faster growth.Funny I've just been down to the grow shop today to get a new hps bulb to veg with...I switched back to mh for veg about 3 months ago and noticed the growth is a lot slower using metal halide idk why but it just is.....hps all the way ftw
Because MH SUCKS, bro lol. It's a shit tech that needs to be outlawed like incandescent lighting.Funny I've just been down to the grow shop today to get a new hps bulb to veg with...I switched back to mh for veg about 3 months ago and noticed the growth is a lot slower using metal halide idk why but it just is.....hps all the way ftw
When I need plant height rather than dense growth it's not about 'the appearance' of growth, it's the real thing!
If you match actual light output there is a huge difference. the cmh bulb are on par with se hps efficiency wise, so if you go watt for watt with se hps, cmh should beat it and be noticeable in doing it.
Height is the appearance of growth vs stacking twice as much in the same height is actually more growth and will produce more when you add the Reds in flower. If you veg an mh plant the same height you would an hps, it will produce more(given the same strain an environment).
315W CMH lamps are as efficient as DE, right there with the best in the HID lighting business. Both are now handily eclipsed by COB LED tech, and the price premium is disappearing rapidly.
Plants grow fine, just longer internodal spacing.
Yeah I didn't speak with exact % because I don't keep up with hid anymore. But that just furthers my point of they work better for veg than hps at the same output. You would have shorter, denser internodes even if the plant was shorter and they should produce more in flower given you flower both under hps. Spectrum X light intensity = plant growth. Most growers use whatever is available to them to get both, but generally you sacrifice one for the other. Cobs are definitely changing the game, but the price of the efficiency upgrade isn't enough yet to get a lot hid growers to swap spectrum for the shear intensity hids put out. It'll happen at somepoint but not quite there yet. And companies like gavita are really holding on to the tech and trying to mod them to keep up with led, but it seems like a losing battle as the efficiency of LEDs continues to dramatically increase and the spectrum choice is hard to beat.
I'm growing vertically. I don't need tight internodal spacing for much/most of their veg cycle. I'm after height, and HPS drelivers REAL, measurable growth of the kind I actually need.
While I totally get your point and growing for your space is definitely what you should be doing. The science is a totally different story. Even running vert, if you had twice as many nodes in The same amount of height, you would still yield more. Utilizing your space to its max efficiency is what we all aim to do. No need to get upset. Just stating how the science behind plant growth/hormones works during veg with spectrum. You're using cobs yeah? What is the reason people are using cobs if they don't produce more watt for watt than hid? Every grower want the most out of their space for the least amount of energy. Efficiency and spectrum are the keys to doing this. You can argue up and down all day about whether hps works better for your setup, which may be true. But I only stated that mh in veg produces more growth than hps when light output is matched. It is science, having to do with spectrum/triggering growth hormones, not anecdotal evidence as your vert setup is.
I'm getting frustrated with you because you keep not citing papers but saying 'science says' and I'm calling your bullshit.
You can be as frustrated as you want. I didn't cite anything because I was pretty sure it was common knowledge. The entire grow lighting industry has been working on/with spectrum customization for flower vs veg forever. To mimic natural sunlight and the beneficial hormones it produces in your plants.
