I set about flashing orchid seeds and have had some success, so thought I would share it with you.
First off, I tried sterilising the jars of media in a large boiler with a few inches of water. I put a lid on and boiled it for about 40 minutes. I left the jars in a shady spot indoors, and a within 8 days, I lost the lot to mould....

I bought a high pressure cooker from the second hand shop, and started again.
This time I didn't lose any jars and I made about 20! Hooray!
I have my seeds and lights set up in the unused toilet at our warehouse, not glamorous, but it is out of everyone's way. I am using warm compact fluorescent coils - just the usual household ones. There are no heat concerns, so I have them as close to the jars as I can get them. They are on a timer for 8.5 hours per day.
The closeup is Den. Canaliculatum corms (sprouts

).
It took about three weeks for the first jar of Dendrobium seeds to start and today (6 weeks later) three more have started. They are all Dendrobiums. I also have Neofenetia and Cattleya seeds which are not sprouting as yet.
I tried to attach more photos but I think they are too large.