Leggy plants

Hi All
I recently set cabbage, PSB and collis  seeds off in the airing cupboard, and as soon as they popped their heads up moved them to a cold garage in a box lined with silver foil with a hydroponic light a foot above them.

Now a week later they are going leggy, does anyone know why?
I brought the light to stop this happening.
Have I done something wrong?

Frost free greenhouse with good all round light is getting up to 35 - 40C by 10:00 am here on a sunny day, forgot to check on my Sprouts and Cabbage seedlings one day and they dried up a died.

Frost free greenhouse with good all round light is getting up to 35 - 40C by 10:00 am here on a sunny day, forgot to check on my Sprouts and Cabbage seedlings one day and they dried up a died.

That is operator error and preventable.  It's easier to cool down a greenhouse than it is to cool down AND illuminate an airing cupboard!

Sorry if we've already had this conversation ... I forget.

If greenhouse is close enough to house, and you are so inclined, you could get a remote thermometer (wireless etc.) so that something in the house could alert you if the temperature in the greenhouse climbed (or fell!) alarmingly

It erks me when I fail to do something and lose some plants   Just found that a mouse?? has eaten the seed-leaves off a whole load of seedlings that germinated a couple of days ago.  That's them for the bin then

CCTV for the greenhouse too perhaps?

I'll get my coat ...