Didn't think those ones were "legal". In that you put the pins in the live end and you are able to touck the pins the other end and 
I have been using Osram Substitube. Not a single one fail in over 2000 (+/-).
You can either install straight into a magnetic type control gear fitting or you adapt the electronic type.
Again if you adapt the electronic type and put them the wrong way around they do pop.

I have been using Osram Substitube. Not a single one fail in over 2000 (+/-).
You can either install straight into a magnetic type control gear fitting or you adapt the electronic type.
Again if you adapt the electronic type and put them the wrong way around they do pop.
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