The article is not givings links for fact but it does suggest the opposite of what I've read here on riu and other sources, all saying that blue MH is better than dual spec-hps for veg. If he did use uni research it at-least holds more water over growers who often don't have ''equal'' enough testing to conclude one is better than the other. Theirs also the element of commitment, after investing a lot of money into one particular setup (not just in this comparison case) people appear to swear blindly their option is the best option, rather than risking the notion they may have wasted money.
A poster on riu stated over 5k is a waste in veg. I'm not saying he is right and you are wrong, but what is your opinion on that?.
Par is better than lumens but lumens are the most valuable factor, studies show that enough green light will grow a plant so although par is important ultimatley if you have enough lumens par isnt as relevant, quantity can be much better than quality if you have enough lumens.
T5 full spectrum growers will testify that having red and blue is better than either on their own. The sun is full spectrum veg or flower outdoors. Dual spec hps still seems very weak with blue light, more of a recent addition in my eyes.
Most 10000k bulbs i see are super blue marine/coral tank bulbs. Fish and coral tank hobbyists have a wider selection of bulbs and kelvin ratings than plant growers and right up to 24000k. I generally use a fish bulb company 'Arcadia Aquatics' than a plant grow company for my t5's as i find they make a much better bulb and 2500k/6500k spectrum, the cheaper plant gro t5's just dont compare but at four times the cost they arent cheap.
Unless he uses the mh during bloom stretch isn't he going to get it anyway?. I do wonder on the concept of hps veg creating a leaf structure ''optimized'' for hps bloom. I read a lot of things on the leaves creating different size and chloro ratios and so forth depending on the light type and intensity.
yah internodal distance needs BLUE to be small, some like lanky but shorter bushy plants are often just the ticket. A Hg vapor plus HPS could probably help with the lanky veg.
Make all that from Arcadia aquatics and throw in their plant pro and i think your a lot closer to full spectrum and pleasing colour to the eye, hopefully more white overall and plants wont know what hit them.
for shit and giggles I will hit my local fish store check out the bulbs . the quality looks so much higher and all the specks are there . sounds like another test . thanks (KINGROW1)