A friend a me both switched from a 250W hps to a
spiderfarmer SF2000 200W nearly a year ago because our temperature were too hot in autumn, spring and winter and plants often burn in summer.
our observations:
we need to veg longer with LED than with the HPS
plants are shorter with the LED than with the HPS
Trunk are thinner with the HPS than with the LED
growing in SOG main colas are usually shorter and less impressive with the LED than with the HPS, on the other hand more secondary branches made it to canopy level with the LED than with the HPS.
Overall there is almost no larfy buds bottom of canopy with the LED while there is a tendencies for more larfy bud bottom of the canopy with the hps
finnaly yield dispersion depending strains and phenotypes seem roughly the same with LED than with the HPS gr/m² is roughly the same, LED offer better gr/w value than with the HPS
in the end both my friend and me are happy with the LED in comparison to the HPS, really improved our issues with heat
Wich media do you use ?
biobizz all mix
How Much is your watering frequency ?
every 7-6 days the first 3 to 4 weeks then every 3-6 days depending strains, seasons, and sometime phenotypes
we usually wait for the bottom leaves to drop a little on most phenotypes to water again
What's your Canopy Temperature/Humidity Range ?
we have no control over temperature and humidity and have to deal with what's the weather like and ambient home temperature and humidity.
temperature vary from 22°C to 36°C (may be even worse when some summer heat spike happen) depending the seasons, my temperature is almost all year long too hot while my friend experience cooler temperature
humidity in the room vary from 20% to 70% depending the seasons and the weather most of the time being between 30% 50%
in the tent humidity could be higher especially when in flower and at night.
What's your max Canopy PPFD ?
mesurement i made were coherent with what
spiderfarmer say on their store page with different lamp height.
What's your VPD target ?
as said no control and from my experience plant don't seem to show signifiant difference regarding that at different growth stage
What's your EC Range ?
not measuring ec
Do they Drink/Transpire more or less under LEDs ?
they doesn't seem, has more to do with strain and phenotypes
Do you feed more or less EC with LEDS ?
Both my friend and me didn't change our feeding schedules and most strains doesn't seem to bother. Also while we run the same soil we don't use the same nutrient line , i m working with
biobizz, and she's working with bio canna and biotabs - bio pk
