Heating a grow box, hot water bottle? help!

[havoksgrow]

Im currently growing in a 2foot tall box with 3 26watt cfls in a basement.
My room is around 20 C° during the day but its canada and winter so my rooms gets cold at night.
Ive pretty much spent all my money so im trying to find a free way to heat up my box at night.
I tried putting a hot water bottle in next to my plants and it seemed to warm it up. However my box now stinks like rubber... could this be bad for my plant?

 

[Richard Richardson]

The plants are hardier than you think, don't worry about heating at night and see how it goes.

 

[havoksgrow]

Thanks for the reply, my plants are already very weak though. almost 2 weeks old, really short with purple stems and deformed leaves.
Ive got a thread about my grows issues and although it appears to be a potassium issue Im trying to eliminate all its potential issues to find the culprit.

Incase you have any input Week old sprouts stunted and purple, Help!

 

[CronicHempHog]

since it would be colder at night set your light schedule on at night off during the day
maybe a bit warmer during the day allowing you to leave the lights off and on at night to help
heat things up? perhaps?

 

[KingJohnC]

I run my vegetative lighting cycle of 18/6 18 hours of light and 6 hours of darkness from 12:00 midnight to 6pm so the lights are on during the coolest parts of the day and off during the warmest parts of the day. I run my flowering lighting cycle of 12/12 12 hours of light and 12 hours of darkness from 12:00 midnight to 12:00 noon so the lights are on during the coolest parts of the day and off during the warmest parts of the day. a reptile ceramic heat lamp may also help you if you do not wish to change your lighting schedule around.

https://www.google.com ceramic heat lamp

https://www.google.com ceramic heat lamp

 

[Fuzzy Duck]

If night time temps are low run your lighting during the night to pick up grow room temps

In the day time lights should be off...

 

[havoksgrow]

I am currently running them 24/0 since they are stil in veg and im using cfls so the cost of running it non stop is low.

 

[KingJohnC]

your heat aside, For vegetative growth I would switch your 24 hour lighting cycle to a 18/6 18 hours of light and 6 hours of darkness schedule. I read a study where lighting schedule versus root growth was tested and plants grown with a 16/8 lighting schedule grew the longest roots, 18/6 was not tested. i was made aware of a study where lighting schedule versus growth was tested and plants given at least 5.5 hours of darkness grew the most.