Ceramic heat emitters

Stumbled across these ceramic heat emitters while trying to solve a small problem of mine, and thought they could be an interesting option for heating a confined/small space.

https://www.google.co.nz/search?q=ceramic+emitters+-+placement+from&rlz=1C1GGGE_enNZ456NZ498&es_sm=93&source=lnms&tbm=isch&sa=X&ei=zDJfU6HPKMKklQW44oGwAg&ved=0CAgQ_AUoAQ&biw=1304&bih=707#facrc=_&imgdii=_&imgrc=CR65KxNKu6gZ1M%3A;mhpgxhw6stxVOM;http%3A%2F%2Fwww.reptiles.swelluk.com%2Fimg%2Fshop%2Foriginal%2Fceramicbulb.JPG;http%3A%2F%2Fwww.reptiles.swelluk.com%2Freptile-supplies%2Freptile-heating-equipment-414%2Fceramic-heaters-561%2Fswell-ceramic-heat-emitters-322320.html;636;450

Look like they could handle a few light knocks, and maybe less a fire risk than other heating options.

Any one here ever used, seen, considered using ceramic heat emitters? How did you find them, any tips on using them?

100 watts will net about 340 btu/hr

Yes I've used em and yes they work great, but they get hot as hell so be careful with em....seriously..

Found em on the net while surfin..

Can't tell ya what I used em for, it's a secret..for now..