1st grow 12/12 from seed

This is my first grow with 12/12 from seed. The plants are just over 5 weeks old now and are developing really well.

They are both Big Bang feminised seeds.

I am using 1 50W and 1 100W bulb.

Here are the pics so far.

March 3rd
http://i2.photobucket.com/albums/y13...f/IMGP2101.jpg
http://i2.photobucket.com/albums/y13...f/IMGP2102.jpg

Today (April 15th)
http://i2.photobucket.com/albums/y13...f/IMGP2190.jpg
http://i2.photobucket.com/albums/y13...f/IMGP2191.jpg
http://i2.photobucket.com/albums/y13...f/IMGP2192.jpg

Could anyone please tell me when I should harvest them?

Thanks,

Thanks for the quick reply, I do have wire mesh at the moment that the plants are growing into. But the wire is green so you cant really see it.

EDIT: what is hermies

Ok thanks for that, I'll try and research it more.