How high

Cubbies69 · Jun 12, 2020

To put 4 2 foot t5s from seed in soil????? These girls are stuck. First time with t5s

stoneyluv · Jun 12, 2020

use the back of your hand as a gauge... if the light is uncomfortable on the back of your hand then it is too warm for the plants. if you can hold your hand there with no feeling that is the best height.

basically as close as you can without burning them.

Dirtbag · Jun 12, 2020

I keep my T5HO lamps about 3-4 inches above the canopy.

MIMedGrower · Jun 12, 2020

In my 3x3 tent with the reflective sides all round i keep 10 2 foot t-5’s 8” - 12” over the canopy.

CapnChronic003 · Jun 12, 2020

You can get some stretch by increasing the DIF in your tent too.

Cubbies69 · Jun 12, 2020

CapnChronic003 said:
You can get some stretch by increasing the DIF in your tent too.

Wait what is different? I'm new to this

CapnChronic003 · Jun 14, 2020

Cubbies69 said:
Wait what is different? I'm new to this

DIF is the difference between day and night temps. For example, 78 day temps and 68 night temps mean a DIF of +10 (positive 10). A positive DIF will promote stem elongation. Try to keep your temps closer together. The more positive the DIF, the stronger the stretch, the more negative the DIF, the less elongation.

Hope this helps!

NairnM16 · Jun 14, 2020

22cm in seedlings 12-18 for veg

Cubbies69 · Jun 14, 2020

NairnM16 said:
22cm in seedlings 12-18 for veg

Thanks

PipeCarver · Jun 14, 2020

Cubbies69 said:
Thanks

T5's can be within 1/2 " of the light without burning the leaves, let it touch the leaves and it will burn them. I had this one a bit too close and overnight it grew onto the lamp. I usually keep them within 6 -10" away

Dr.B · Jun 14, 2020

12 - 18" above the plants for me, but I run low wattage LED's alongside my t5's, they pump out a bit more heat than the t5's do.

PipeCarver · Jun 14, 2020

Dr.B said:
12 - 18" above the plants for me, but I run low wattage LED's alongside my t5's, they pump out a bit more heat than the t5's do.

That's why I like T5's , I like the heat they put out. The lights alone heat my veg room through most of the year. It's only the deepest darkest days of winter I've had to add more heat but with my new 6 tube fixture it may be enough alone to keep temps up.

Dr.B · Jun 14, 2020

PipeCarver said:
That's why I like T5's , I like the heat they put out. The lights alone heat my veg room through most of the year. It's only the deepest darkest days of winter I've had to add more heat but with my new 6 tube fixture it may be enough alone to keep temps up.

Same here. I'm at about a 51 degree north latitude, winters require some heat supplementation but most of the time my lights effectively heat the room. I run an oil filled digital radiator 24/7 365 near the tents at 23 C just to maintain a baseline in the room. More often than not it sits idle.

How high

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