NorthofEngland
Well-Known Member
A used car salesman from Surrey was selling 1000w Metal Halide bulbs very cheaply on ebay.
It sounded too good to be true (used car salesmen are notoriously dishonest and Surrey is an overspill area for Londoners - also notoriously dishonest) but I ordered one because the price was too good to miss.
A few days later it arrived, was brand new and in working order.
It's CCT is 4000k.
Greg Green in The Cannabis Grow Bible writes:
"Daylight MH lights have a CCT rating of about 5,500K. Standard clear MH have a CCT of 4000K. 'Warm' MH lights also exist and hve a CCT rating of 3,200K. Opt for the DAYLIGHT halide as it provides the best possible type of MH light for cannabis plants"
Although the 5,500K MH bulbs are considered the best, the 4000K 'standard clear' bulbs fall inbetween the 'daylight 5500k' and the 'warm 3200k'
So I assume that they are still an effective way to grow during the vegetative stage of growth?
I contacted the seller, negotiated a 20% reduction in price and ordered another three.
Next crop I will keep a detailed journal of growing progress during the first 3 weeks of (18/6) vegetative growth.
The crop after that I will use a 5500k MH and keep a similar journal.
Then I can make a highly unscientific comparison between the vegetative growth using MH 4000K and MH 5500K.
But all four of these 1000w MH bulbs combined have cost less than just ONE 1000w Powerplant or Lumatek bulb
It sounded too good to be true (used car salesmen are notoriously dishonest and Surrey is an overspill area for Londoners - also notoriously dishonest) but I ordered one because the price was too good to miss.
A few days later it arrived, was brand new and in working order.
It's CCT is 4000k.
Greg Green in The Cannabis Grow Bible writes:
"Daylight MH lights have a CCT rating of about 5,500K. Standard clear MH have a CCT of 4000K. 'Warm' MH lights also exist and hve a CCT rating of 3,200K. Opt for the DAYLIGHT halide as it provides the best possible type of MH light for cannabis plants"
Although the 5,500K MH bulbs are considered the best, the 4000K 'standard clear' bulbs fall inbetween the 'daylight 5500k' and the 'warm 3200k'
So I assume that they are still an effective way to grow during the vegetative stage of growth?
I contacted the seller, negotiated a 20% reduction in price and ordered another three.
Next crop I will keep a detailed journal of growing progress during the first 3 weeks of (18/6) vegetative growth.
The crop after that I will use a 5500k MH and keep a similar journal.
Then I can make a highly unscientific comparison between the vegetative growth using MH 4000K and MH 5500K.
But all four of these 1000w MH bulbs combined have cost less than just ONE 1000w Powerplant or Lumatek bulb