Swapping to LED for Summer

markrossiter11111

markrossiter11111

Member
Currently run a 250w Hps in a 60x60x120cm tent

I want to change to LED for the hotter months ,

I want I think 300w although lots of 200w available ,

My budget is like Maxibright , Spider Farmer or Mars Hydro range ...

Would 200w be enough

I'm leaning toward 300w

Is this a good light ?

Tia.
 

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If you're in the Mars ecosystem, that's a good fit.
markrossiter11111 said:
Currently run a 250w Hps in a 60x60x100cm tent

I want to change to LED for the hotter months ,

I want I think 300w although lots of 200w available ,

My budget is like Maxibright , Spider Farmer or Mars Hydro range ...

Would 200w be enough

I'm leaning toward 300w

Is this a good light ?

Tia.
Click to expand...
Why are you "leaning toward 300w"?
 
300w is absolutely overkill, especially with that little headroom. 120 would be pretty standard in that space but always good to have a bit extra. Youll need some type of bar light to spread the light out over the space, a single board with that little head room is not a good fit. 30-40w per square foot is standard advice for leds. Wayback when leds were given fake wattages based on max spec of the diodes, nowadays its always wall draw which is more representative
 
Rocket Soul said:
300w is absolutely overkill, especially with that little headroom. 120 would be pretty standard in that space but always good to have a bit extra. Youll need some type of bar light to spread the light out over the space, a single board with that little head room is not a good fit. 30-40w per square foot is standard advice for leds. Wayback when leds were given fake wattages based on max spec of the diodes, nowadays its always wall draw which is more representative
Click to expand...
It's 1m20cm tall.
 
250W HPS produces around 1.7 umol/W, so ~425 umol/s
Most of the LEDs produce ~2.5 umol/W, so with 180W you'd get pretty much same amount of light.

So look for LED that has around 450-600umol/s. which would be around 200W.
 
cage said:
250W HPS produces around 1.7 umol/W, so ~425 umol/s
Most of the LEDs produce ~2.5 umol/W, so with 180W you'd get pretty much same amount of light.

So look for LED that has around 450-600umol/s. which would be around 200W.
Click to expand...
This ?
 

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markrossiter11111 said:
I'm worried from a 200w I won't get dense bud formations ?
Click to expand...
That's partially genetic but light intensity, apparently, plays a role.

In a 60cm tent, the Vipar Spectra XS 1500 Pro is the cat's meow. You can shoehorn the Mars in a tent that size but you can't use all of the light that it generates, the Vipar (probably) has a better spectrum for a tent that size, the Mars has a better PPFD map, and it's ½ the price of the Mars.
 
Delps8 said:
That's partially genetic but light intensity, apparently, plays a role.

In a 60cm tent, the Vipar Spectra XS 1500 Pro is the cat's meow. You can shoehorn the Mars in a tent that size but you can't use all of the light that it generates, the Vipar (probably) has a better spectrum for a tent that size, the Mars has a better PPFD map, and it's ½ the price of the Mars.
Click to expand...
I have ordered the SF2000 pro
I did see the VS but it's slightly bigger ,

I also looked at the Maxibright 200w pro but it's a very tight fit!
 
I use 40w sq/ft as a guide. You have basically 4 sq/ft. 4 x 40= 160w.

At that rate, a 160w, would be fine.
But one can buy a bit more powerful light, with dimming function, and wont run the light as hard. At that rate, 200w would work.
Just make sure the light has quality LED chips.
 
Delps8 said:
That's partially genetic but light intensity, apparently, plays a role.

In a 60cm tent, the Vipar Spectra XS 1500 Pro is the cat's meow. You can shoehorn the Mars in a tent that size but you can't use all of the light that it generates, the Vipar (probably) has a better spectrum for a tent that size, the Mars has a better PPFD map, and it's ½ the price of the Mars.
Click to expand...
+1 for the XS1500 pro. It’s a great light to use in a 2x2. Whether or not you will need all 150w depends on genetics and/or feeding habits. There’s always the option to dim it, and you can extend the life of the driver at the same time.
Here’s on next to a BP 1500 by bloom plus in a 27” x 27” x 62” tent. IMG_6932.jpeg

Lots of fat tops in that harvest.
IMG_7257.jpeg
 
OP: i would also check carefully SFs par maps. Doing calculations by watts is usually quite fine but its likely that this light will bleach tops if they are too tall as it concentrates the light to the centre a bit; this is why i would rec a bar light, or that vipar that has lenses that even out the spread really nicely.
Most people have problems growing at +1000ppfd, especially if your grow tent is running cool (which is a distinct possibility with leds). I recommend looking into how to run a led grow (running temps a bit higher in veg and start of flower, +80F)
 
Rocket Soul said:
OP: i would also check carefully SFs par maps. Doing calculations by watts is usually quite fine but its likely that this light will bleach tops if they are too tall as it concentrates the light to the centre a bit; this is why i would rec a bar light, or that vipar that has lenses that even out the spread really nicely.
Most people have problems growing at +1000ppfd, especially if your grow tent is running cool (which is a distinct possibility with leds). I recommend looking into how to run a led grow (running temps a bit higher in veg and start of flower, +80F)
Click to expand...
I have ordered the SF2000 pro
It states that it's built for square tents 2x2 or 3x3 so I'm hoping it'll be great ,
I have very little led experience apart from my little veg corner
 

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markrossiter11111 said:
I have ordered the SF2000 pro
It states that it's built for square tents 2x2 or 3x3 so I'm hoping it'll be great ,
I have very little led experience apart from my little veg corner
Click to expand...
Led plants drink and transpire less than hid plants. So they may need a combo of a little more heat and sometimes a bit more nutes; not in totals but like in concentration; drinking less of a stronger juice. But in any case transpiration should be the first priority before messing with nutes; making sure that the plant has well stretched out leaves and nothing sloppy in it posture, generally running hotter temps. Can be tricky in start of veg; cant turn the ligh up too high and shock it, but then again low watts on lamp may not heat enough. Aim for +80F in veg, it wont hurt but actually thrive. Generally temps and light intensity go up at the same time as your hardening the plant. You have all the extra watts youll ever need, i would advice against trying to max wattage your first run and go very slow with raising intensity. Light stunted led plants are problematic for ages. Once you get the hang of it youll be able to give more light but i truly thing that a 50w per square foot with centre hotspot with limited height is a recipe for light stunting and bleaching.
 
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