Both these reference systems are used industry-wide so the customer has a clear indication of compatibility between manufacturers products.

Other order codes are similar to incandescent lamps but the information sequence changes, e.g. G95/150/ES/230.W is a 230V 150W HaloGlobe with White bulb and ES cap.

FLUORESCENT LAMPS
There are six different categories of fluorescent lamps:
1. Standard Bi-pin (T8 and Tl2)
2. Miniature (T5)
3. Mod-U-Line
4. Circline
5. The Biax range - Biax, Biax D, T, Q and 2D



Figure 2.15. Fluorescent lamp categories.

Fluorescent Tube Diameter
This is measured in eighths of an inch and has the prefix "T" so T8 is a tube of one inch in diameter. Customers may quote metric measurements. 16mm is T5, 26mm is T8 and 38mm is T12.

Apart from the standard types mentioned above there are special types from America, some of which are imported into Europe:

• Watt-Miser
• Slimline
• High Output
• Powergroove
• Tl0

These usually require non-European standard control gear and so demand is limited to equipment imported from North America with lighting already built in. A significant proportion of these lamps is not available direct from GE in Europe.