[satyr]

I have a Mh conversion bulb I mostly used for vegging.

Last time around I did not replace it with a Hps until 30 days into flower. What was evident was the lack of strech, and generally, better looking plants.

I have been looking around and to me it seems that a lot of yanks use the Mh all the way through flowering. Europeans dont. Why is that ?

Is there difference in yield or quality and how much does the better PAR spectrum in a Mh outweigh the lumens in a HPS.

Another thing puzzling my mind is whether I would benefit more than the watts spend if I gave my darlings maybe 4-6 hours of supplmental HPS/Mh.

Like 30 days with 12 hours Mh and 4 hours of supplemntal HPS and then switch to 30 days 12h HPS/4 hours Mh.

Anybody done any experiments with "light boost hours" anyway. I tried it out and it seemed my buds really got much more compact and excellent yield.

I figured that you get rewarded for the amount of watts spent, in weight but it seemed like i got more than i put in. I was thinking a bit like it emulated a normal day with more intense sunlight at the peak of the day.

Any comments ?

[satyr]

By the way.....thinking in watt saving....When in the flowering period would it be most beneficial to increase lighting. Last month or last two weeks.

[oldsmoker]

the only problem with those conversion bulbs is they dont have a very high lumen per watt ratio when compared to a hps.
Dont get me wrong I have one myself, but I also have a true 400w Mh

[satyr]

Hej Oldsmoker...

I am aware of the lumen matter, but a lot of folks questions the validity of lumens as the sole component for growth and always refer to the PAR spectrum as more important than lumens.
Also the cultural divide with a lot of yanks swearing to the Mh bulbs makes me wonder if they are into somehing i dont know about.

Maybe I should set up an experiment with some clones half gets Mh other half gets HPS, but this test must have been done ages ago by some one else. But threads always end up with some semireligious discussions among the debaters, but no facts.

Oldsmoker, did you ever use Mh all the way through flowering and when do you change bulbs in general. Usually I changed ferts and HID when i switched to 12/12 but i like the reduced stretch and more compact growth pattern from the Mh in the first 30 days flowering.

I guess this is a trial and error question but I guess it should concern us all. How to the most bang for your watts.

[Brightshadow]

Originally Posted by satyr

Hej Oldsmoker...

Maybe I should set up an experiment with some clones half gets Mh other half gets HPS, but this test must have been done ages ago by some one else. But threads always end up with some semireligious discussions among the debaters, but no facts.

Jeg så i en gammel Canna-video at de siger at man skal bruge et forhold på 2 MH til 1 HPS i blomstrings perioden..

Og så lige et dumt spørsmål.. Jeg har aldrig prøvet MH i praksis:

Så hvad er forskellen på en "Ægte" MH og en "conversion" MH..?

Og kan jeg bruge en Ægte MH i en HPS/MH Balast.. ?

[oldsmoker]

Hi Satyr in the past I have kept the Mh and added an additional Hps at flower time
that works great as you get Mh tight plants and the bloom of hps :-)

[ICETOKER]

I am currently running a 400wmh conv. lamp. i am 3 days in 12/12 and plan on switching to hps when first flowers form (c.a. 2 weeks into flower). I love mh in veg. Gives tight and healty plants

[oldsmoker]

yeah plus the photo's you take under MH look tasty

[oldsmoker]

Sorry BS didnt see your post , one big difference is price of bulb
MH are expensive but as you only need to use them for a few weeks
they last a long time.
also I got mine some 20 years ago and I remember that the ballest cost
twice as much as the Hps I got at the same time.
as for how they compare to conversion bulbs, do a google and see

[Brightshadow]

Originally Posted by oldsmoker

Sorry BS didnt see your post , one big difference is price of bulb
MH are expensive but as you only need to use them for a few weeks
they last a long time.
also I got mine some 20 years ago and I remember that the ballest cost
twice as much as the Hps I got at the same time.
as for how they compare to conversion bulbs, do a google and see

Hej Oldsmoker..(og andre

Jeg har prøvet at google på det man forstår det desvære ikke..

Hvis vi siger at jeg har en HPS/MH balast kan den så kun køre med "conversion bulbs" henholdsvis HPS eller MH ??

Jeg ville da mene at mine HPS pære er ægte HPS og ikke conversion bulbs..
Er jeg helt galt på den ?

Og vil jeg få flere lumens ved at købe en balast til hver ?

Jeg har overvejet at sætte 2 balaste op og køre vegge + de første 3-4ugers blomstring på en 400w ægte MH og de sidste 4-6uger på en 600w ægte HPS..

Bright-Light-Shadow