[rrog]

I'd like to use MH in veg and HPS in flower. No special bulbs, no EYE Hort.

Using a more red HPS is not ideal according to some who feel the Blue Hort keeps plants shorter and develop more resin.

I haven't found anything definitive with searches yet. Lots of opinions both ways, though.

My intuition says they're not likely to stretch less with blue. Also I'd be surprised if blue helped with resin.

I'd be more inclined to believe these opinions started with EYE Hortilux than growers.

[rives]

It would be good if you could compare the SPD charts (spectral power distribution) to see exactly what each lamp is putting out. I know from my experience with both PL-L lamps and my led fixture that blue will keep the plant shorter and the internodal spacing tighter. I don't have any idea about the impact on resin production.

[rrog]

Thanks rives. How you been? I'm thinking that the resin aspect of all of this comes about from the UV-b that MH can output. Blue likely doesn't have an effect on resin.

So you found the blue kept things shorter. Among the same strains.

I can compare charts, but essentially I'm just wondering about the potential benefits of blue in flower. I know that a blue hort has blue and MH has blue. I guess I'm thinking that if I have a standard HPS in flower, it's probably not worth it to add a MH or blue hort to get a bit more blue.

I do have a very specific bulb for UV-b, however. 8 hours a day

[paladin420]

Tagged...this is one of the great questions imho...Puf puf pass to Phaeton. I think he can smell the colors...

[alkalien]

There are quite a few people who claim, that a higher dosage UV a/b will increase the resin production since the plant uses the resin to protect from too much light. That is claimed to be the reason highland Sativas are stronger and frostier than lowland indicas. I just saw a Howard Marks video in which he says he allways bought hash from high countries for the stronger resin production on higher fields.

My LEDs Systems seem to have that effect, I get frosty buds. I don't touch my buds for smoking an longer I allways use something so my fingers don't get sticky. I love it!

However on the downside I have plants with about 2 monts of veg which don't stretch at all in flower. A plant that comes from a fully rooted 15cm clone and gets two monts of veg shoould be more than 50cm high when stretch is over, shouldn't it?

[rrog]

I'm can't answer your question, but in my opinion, the resin has nothing to do with light protection. I believe that is simply a perpetuated urban legend.

I believe there is a relationship between resin and UV-b, so I use UV-b. So far, still not seeing a compelling reason to add blue, however. Internodal spacing may be shortened, but I'm not tempted to add blue just to get that feature. I'm much more concerned about producing crazy good quality

[BudZad7]

Hi All !! Nice Info from all ....Experience is the key, and lots of years of trial and error, also, people tell you what they like/dislike, then you dial in various qualities of certain strains, looks like Haze crosses and making a comeback, anyway the topic of LIGHTS

In the 80's we had MH lighting the bulbs had 5500 Kelvin color temp
people loved all that was grown under these lights,lots of RESIN
The idea of growing indoors, was to simulate outdoors inside......
So, during bloom 12 hr period turn on your HPS the 1st 3 hrs only, then
the next 6 hrs MH only, no HPS, then the last 3 hrs HPS only.....
this as you can see, simulate outdoor light in the fall
Early in the morning outdoors, it's orange glowy light is Awsome for photography, and all plants love it, and this happens again in the early evening, but mid day is more white light, so MH light,,,your budz will be of a Better balanced quality Try this lighting setup, you will be Happy!
Also, here on this planet, is there a place that has orange light only all day long, yeah, maybe on MARS !!! LOL!~

[rrog]

Thanks BudZ. I can appreciate people wanting to mimic the light during a typical day, as you've described. In general, nature does it best. I haven't yet seen a real smoke-quality advantage to a lot of blue during flower. UV-b, I'm on board with. Blue? Not on board.

[supermanlives]

when i used mh in flower . plants were shorter with tighter node spacing and i believe a tiny bit more resin. yield was a bit lower than hps

[rrog]

Thanks Super. Seems consistent that the blue shortens internodes. I think the resin is more related to the UV-b that you apparently get a bit of with MH