Quantum Board vs Quantum Bars or Strips

unfiltered

Well-Known Member
Hi, I've been using a few Chinese Quantum Boards and they were great. Now, I have a new tent and need more LEDs. While using the QB's, there were always issue of cal/mag deficiencies due to the QB's being too strong and the canopy could never get closer than 2ft from the QB's. I know you could dim the QB's, but now the light inverse square law kicks in and you lose intensity. I've read that the Quantum Bars or Strips with the same Samsung diodes (e.g. lm301b/h) give better even coverage and the canopy can get closer to the Bars/Strips without too much intensity around the center of the boards.

Anyone got any run under your belt with the LED bars/strips that you can give some info/feedbacks? Were there any deficiencies issues common with the QB's? How close can the canopy get to the bars/strips?

Thanks!
 

pulpoinspace

Well-Known Member
bar lights have a similar problem with hotspots in the center but are generally run closer than boards. I think some of the bar lights say they should be as close as 6" but I wouldn't put them closer than 10" or 12". Most manufacturers provide par maps that you can look at for Par values/spread.

personally i commonly saw deficiencies in veg when using various LEDs but not really in flower. It's common for people to recommend additional cal-mag if using R/O water or epsom salt if using tap water. The style of light you get isn't going to determine if you see deficiencies. That will just have to be dialed in on a per strain, under your light, in your environment basis.

Having said that, a powerful hot spot in the center of the light can lead to problems in just that area. There are bar lights that have fewer bars in the center, and some lamps that have less diodes toward the center to counter this, but ultimately the best solution currently is DIY imo. Or wait for the HLG scorpion it looks pretty good.
 
bar lights have a similar problem with hotspots in the center but are generally run closer than boards. I think some of the bar lights say they should be as close as 6" but I wouldn't put them closer than 10" or 12". Most manufacturers provide par maps that you can look at for Par values/spread.

personally i commonly saw deficiencies in veg when using various LEDs but not really in flower. It's common for people to recommend additional cal-mag if using R/O water or epsom salt if using tap water. The style of light you get isn't going to determine if you see deficiencies. That will just have to be dialed in on a per strain, under your light, in your environment basis.

Having said that, a powerful hot spot in the center of the light can lead to problems in just that area. There are bar lights that have fewer bars in the center, and some lamps that have less diodes toward the center to counter this, but ultimately the best solution currently is DIY imo. Or wait for the HLG scorpion it looks pretty good.
What would be the Best equipment to by for a 4x4 grow looking to diy a quantum board any advice would help
 

pulpoinspace

Well-Known Member
What would be the Best equipment to by for a 4x4 grow looking to diy a quantum board any advice would help
I like the scorpion R spec, the rapid led puck fixture, the timber cob fixtures, and DIY with the hlg 96 pucks.

anything with any of those in the timber or scorpion layout (i.e no hot spot in the center) would be best for a tent imo. All the spectrums are good imo. For timber id do 3500k90cri.
 
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