An LED tube lamp includes a lamp tube, an LED light bar disposed inside the lamp tube with a plurality of LED light sources provided on the LED light bar, a diffusion film layer disposed inside the lamp tube and configured to transmit the light emitted from the LED light sources, and a reflective film layer disposed on an inner circumferential surface of the lamp tube. The reflective film layer is configured to partially occupy the inner circumferential surface of the lamp tube along a longitudinal direction and a circumferential direction of the lamp tube, and the diffusion film layer is a sheet disposed to cover the LED light sources without making direct contact with the LED light sources.
1. An LED tube lamp, comprising:
a lamp tube;
an LED light bar disposed inside the lamp tube with a plurality of LED light sources provided on the LED light bar;
a diffusion film layer disposed inside the lamp tube and configured to transmit the light emitted from the LED light sources; and
a reflective film layer disposed on an inner circumferential surface of the lamp tube;
wherein the reflective film layer is conformally formed on the inner circumferential surface of the lamp tube and is configured to partially occupy the inner circumferential surface of the lamp tube along a longitudinal direction and a circumferential direction of the lamp tube, and the diffusion film layer is a sheet disposed to cover the LED light sources without making direct contact with the LED light sources, and
wherein a portion of the conformally formed reflective film layer extends above at least part of the diffusion film layer.
2. The LED tube lamp according to claim 1 ,
wherein the reflective film layer further comprises an opening; and
the LED light bar is disposed in the opening.
3. The LED tube lamp of claim 2 , wherein the opening is shaped to properly accommodate the LED light bar.
4. The LED tube lamp of claim 1 , wherein the reflective film layer further comprises an opening; and
an LED light source is disposed in the opening.
5. The LED tube lamp of claim 4 , wherein the opening is shaped to properly accommodate the LED light source.
6. The LED tube lamp of claim 4 , wherein the size of the opening is the same or slightly larger than the size of the LED light source.
7. The LED tube lamp of claim 4 , wherein the LED light bar is adjacent to one side of the reflective film layer along the circumferential direction of the lamp tube.
8. The LED tube lamp of claim 4 , wherein two portions of the reflective film layer beside the two opposite sides of the LED light bar along the circumferential direction of the lamp tube have substantially the same area.
9. The LED tube lamp of claim 1 , wherein the reflective film layer is configured to extend from one side of the LED light bar and along the circumferential direction of the lamp tube.
10. The LED tube lamp of claim 1 , wherein the reflective film layer is configured to extend from two sides of the LED light bar and along the circumferential direction of the lamp tube.
11. The LED tube lamp of claim 1 ,
wherein the LED light bar is disposed on the reflective film layer.
12. The LED tube lamp of claim 1 , wherein a ratio of a length of the reflective film layer that extends along the inner circumferential surface of the lamp tube to a circumferential length of the inner circumferential surface of the lamp tube is 0.3 to 0.5.
13. The LED tube lamp of claim 12 , wherein the LED light bar is disposed along the longitudinal direction of the lamp tube.
14. The LED tube lamp of claim 1 , wherein the reflective film layer has a reflectance of 85% or more.
15. The LED tube lamp of claim 1 , wherein the average thickness of the reflective film layer has a value in the range from 140 μm to 350 μm.
16. The LED tube lamp of claim 1 , wherein the LED light bar is bendable.
17. The LED tube lamp of claim 1 , wherein the reflective film layer further comprises at least one of strontium phosphate and barium sulfate.
18. The LED tube lamp of claim 17 , wherein the reflective film layer comprises strontium phosphate.