How to differentiate the LOFT lamp from the SIGNAL lamp?

Creation dates:

The LOFT lamp made its debut in 1950, formerly called LAMPE STANDARD and later renamed when it was sold in decoration in 1985.
And in 2003, a replica of the original lamp was born in a smaller size, the SIGNAL lamp.

The wireless system:

The LOFT lamp has a revolutionary system invented by Jean-Louis Domecq, a wireless system using chrysocal wavy contacts that circulate the current within the joints.
The SIGNAL lamp has a classic system with wires to circulate the current.

The weight :

The LOFT lamp is more massive and weighs heavier than the signal lamp.

The dimensions :

The Loft lamp has thicker and generally longer arms, its reflector is larger measuring Ø15cm and Ø20cm on some models.

The SIGNAL lamp has a reflector 10 cm in diameter.

Little tip:

You can tell them apart with the naked eye thanks to the small rim
on the bottom of the reflector which is only on the LOFT lamp.