Dual Spectrum Lighting?.

Ive always used phillips Son t bulbs. It has a whiter yellow to it and a double spectrum and hence more complete than other bulbs.
Though to be honest, i think leds finally have a good enough penetration and a closer spectum to sunlight. Im seriously considering trying them out now.

VibRooter said:

Everyone I've seen using UVB, run them on a separate timer. It's been so long since I did research, I forget exactly why, but basically less is more with them. in a 12 hour lights on period, the first 2 hours have no uvb, on the third and fourth hour they run for 5 mins, on the fifth hour 10 mins, sixth and seventh hour 15 mins, eighth hour 10 mins, ninth and tenth hour 5 mins, last two hours off. This cycle provides a more "natural" exposure to uvb rays, that plants would see in a place like Afghanastan, where uvb's are high. It also allows the grower time to work in the garden without being exposed to the harmful effects of uvb rays. Sorry I don't have a more exact answer of why, it has been a while, but the information is out there. I am a big fan of dual/multi spectrum lights in the grow room and have had great results.

Click to expand...

Sounds like someone is attempting to replicate passing cloud cover...lol

Mine stay on for about 8 hours daily. I'd have to dig deep in this section, but there is a comprehensive study showing the benefits of UV/B even in vegetative states.

I use 600hps+250mh vertical bare bulbs for flowering... ive heard 1/3 blue is optimal. i had 400mh for veg and 600hps for flower. when veg area was done i would add the 400 to the flowering area. stumbled on some info saying 1/3 blue spectrum. sooo i bought a 250mh bulb to stay in with the 600hps 4x4 flower area so i could get that ratio and not have to move the light. I say if u can add light and have temps controlled it will be worth it in the end.

I grew a giant Bubblegummer a year ago in a trash can with nothing but CFL's. I used 6500k for vegging around 3 months. I switched to flower with 2700k bulbs. I flowered this thing for almost 16 weeks until I literally couldn't stand it anymore. The trichs were showing no maturation at all. They stayed clear or slightly frosty, never turning amber as one would expect. I spoke to a couple people about this strain and my methods of growing and it was suggested that I include a cooler light spectrum with my 2700k bulbs. As soon as I added the additional spectrum, the trichs were done in less than a week. It's almost as though the plant was waiting to see something other than the 2700 before it finished. From that day forward, I always try to include a wide range of light spectrum to my grows and have never seen that problem again. Obviously, the idea for the indoor grower is to try to replicate what occurs outside. Even during the fall months, the sun is still providing full spectrum, leaning a little more to the warm side but still giving all the wavelengths.

I just read a great article on this, but can't remember where I found it. Pretty much what everyone here is saying. Run the hps overhead and run MH or CFL's bare bulbed vertically. Has anyone tried the SON AGRO HPS bulbs? Expensive little suckers, but maybe they are worth it.

I do not use HPS/MH but the spectrums mj needs are universal.

We know that mj needs only ~ 20% blue in veg and < 10% throughout flower.

I mix equal amounts of 3500 + 5000 in veg. In the past I added 4 x 4ft @ 16w led tubes, but this grow I am adding 2 x 3ft BML led rails for flowering. I may well remove the 5000 at that time

See my thread to follow along

I'm pretty sure you will be amazed. These are not chinese crap