Toshiba Lighting & Technology Corp announced two (daylight- and incandescent-color) cylindrical (T-type) LED light bulbs in the "E-core" series.
The brightnesses of the daylight- and incandescent-color products are 600 and 485lm, respectively, which are equivalent to the brightness of a 40W incandescent light bulb. Their rated power consumption is 7.4W. This is the first time that the company has announced to release a T-type LED light bulb.
Toshiba Lighting & Technology expects that the new LED light bulbs will replace D- and T-type cylindrical fluorescent light bulbs (the D-type has an exposed fluorescent tube, and the T-type has a covered fluorescent tube). D- and T-type fluorescent light bulbs are often used in apparatuses that require a compact lamp. And, in many cases, E26-base "normal" LED light bulbs cannot be used for them.
On the other hand, the new product (T-type, 7.4W) can be used for apparatuses that require a D- or T-type fluorescent light bulb (except for apparatuses using heat insulating materials). So, the new product is targeted at bracket lamps, pendant lamps, downlights having laterally-facing bases and other lamps that utilize light from an entire lamp.
Also, the new lamp can be used for apparatuses that enclose a lamp like those seen in a bathroom. But it cannot be used for apparatuses capable of changing light intensity or circuits.
The external diameter, length and light distribution angle of the 7.4W T-type product are 40mm, 109mm and about 300°, respectively, which are equivalent to those of Toshiba Lighting & Technology's D-type fluorescent light bulb (FED15/13-Z). The company realized the wide light distribution angle by using the light reflected inside the cylindrical globe (case), placing an LED light source at a lower position (the bottom of the globe), etc.