There are some newer fittings available with high frequency ballasts, and a thinner than normal tube, which is even more energy efficient. Is that what you mean?
Dont forget the old T12
12/8ths of an inch =0ne and a half inches
you now have a T4 in production as well.
The smaller the tubes are getting the better the gas inside.
most T5 are 8 gas (840) for example, they are Triphosphor gas, also used in most cfl lamps.
newer stuff is starting to use 9 gas this is multiphosphor gas and even better.
I wish it was a standard. Get T4 10W lamps from two different manufacturers and chances are they will be different lengths!
It does seem to vary but in general T4 are the most efficient, both in terms of light per watt but remember that they are smaller. So if you want to fill a big area then you can end up using lots of T4 lamps and using more energy than you had planned.
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