I bought 2 150w eBay ceramics yesterday... I don't see how they can pose a danger because all the danger of ceramic bulbs are within the fitting themselfs.. But I am going to change them over time for brands anyway.
All my lamp holders are Komodo.
I did also manage to pickup 2 16cm guards off eBay yesterday by
Pro rep for £8.99. Well chuffed
I gutted all my spare lamps such as exo terra glowlight and lucky reptile reflector.. Ripped out the ceramic fittings and re wired them to get Some more fittings.. Just waiting on my self adhesive cable clips now.