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Sarahnya

Light For New Seedlings

23 posts in this topic

Is it possible to use just a normal daylight bulb on brand new seedlings?  I was hoping I could use it for the first few days and then use my hps set to 250w.

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Posted (edited)

large.starterlamps3b.jpgYes no problem though you might want more than one depending on how many seeds you sow.

Edited by cultivateur
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How close can you get the CFL's to the seedlings? I'm about to start soon with CFL (40w) on a couple of babies (autos) then move them outside. Also, I've read that you can stick autos on 24/7 before moving them out. Any experience of this?

Cheers.

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You can get a cfl within a few inches of a seedling - too far back and they will stretch and get very spindly. As @cultivateur said, better to use a few bulbs if you have a few seedlings - but one bulb will cover two if need be.

 

You can run any seed lights on 24/7, but many advise a short rest - 20 on, 4 off seems quite popular. I've never grown outside so I can't say what's best to do to prep them for that.

 

Good luck!

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On 13/03/2018 at 0:36 PM, srfr said:

How close can you get the CFL's to the seedlings? I'm about to start soon with CFL (40w) on a couple of babies (autos) then move them outside. Also, I've read that you can stick autos on 24/7 before moving them out. Any experience of this?

Cheers.

t5-grow-light-60cm-4-tube__78867.jpg

 

 

Im rocking one of this bad boys ! Dosnt give of any heat bulb side !

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I think I used to use the width of my thumb for CFLs and the span of my hand for a 250 watt HPS.

I find non-diffused LEDs more problematic and probably had them a bit far from my seedlings this grow - perhaps I should have used a diffuser of some sort.

 

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Posted (edited)

I like T8 over cfl for seedlings. Always kept an inch from the top and they thrive in Rockwood starters. 

Edited by Redeyezman

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On 3/17/2018 at 0:19 PM, cultivateur said:

I think I used to use the width of my thumb for CFLs and the span of my hand for a 250 watt HPS.

I find non-diffused LEDs more problematic and probably had them a bit far from my seedlings this grow - perhaps I should have used a diffuser of some sort.

 

I’ve read 2-4 inches. I guess I’ll just play it by ear. I don’t want to burn the babies or have them stretch. 

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19 minutes ago, srfr said:

I’ve read 2-4 inches. I guess I’ll just play it by ear. I don’t want to burn the babies or have them stretch. 

 

It's having the seedlings too far from the light that makes them stretch !

My thumb is about 1.5 to 2 inches wide.

 

Make sure you have a decent breeze blowing on them.

 

Those propped-up seedlings under the 250 watt HPS in the photo above are stretched because I started them too far from a T12 fluorescent :-

 

That said, if you check out the rest of the tiki mix grow, you'll see they bucked up pretty soon :)

 

post-14131-1150286193.jpg

Edited by cultivateur
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I'm using CFL's for various reasons but I can see how T8 Fluorescent tubes would be ideal as they run so cool. Maybe next time.

And I do realise that stretching is from the plants reaching for the light but I'm just nervous about putting the CFL too close and burning. I'll stick with ol' fat thumbs 2 inch advice! :naughty:

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Posted (edited)

Well I couldn't afford to buy more lighting so I thought I'd make a start. 

 

I soaked the seeds overnight and put in Root riots, 1 came up after 2 days and the other 2 came up the day after. 

 

I put them under a mini sun bulb for 2 days but they seem a bit stretchy and I can't get the light closer.  I've now put them into the tent and set the HPS to 250.

 

Hoping this goes ok.  How does one attach photos here? 

Edited by Sarahnya

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How far should they be from 250w HPS? 

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On 21/03/2018 at 2:48 PM, srfr said:

I'm using CFL's for various reasons but I can see how T8 Fluorescent tubes would be ideal as they run so cool. Maybe next time.

And I do realise that stretching is from the plants reaching for the light but I'm just nervous about putting the CFL too close and burning. I'll stick with ol' fat thumbs 2 inch advice! :naughty:

 

I made a mistake earlier - it was T8s that made my seedlings stretch, I imagine T5s would be about as intense as small CFLs.

I reckon that sort of diffused intensity is about optimal for seedlings. I'm finding non-diffused low power LEDs to be more challenging to get used to.

 

I so wish I had photos from my vertical T8 grow - I'm nostalgic for the smoke I got from that - though it was also a stunning pheno I was growing back then.

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Just now, Sarahnya said:

How far should they be from 250w HPS? 

 

I reckon about 9 inches for seedlings - but make sure you have a fan blowing.

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Posted (edited)

I'm much more relaxed about starting garden ornamentals.

I raise a lot of things like wallflowers under 4000K LED strips spread over 3 times the area than I used for my current grow and because they are in longer parallel strips, they consume less power - with a larger proportion of it going to heat.

 

It's always a bit nail-bitey when you've paid £10 for a seed and are on a tight schedule ...

Edited by cultivateur

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