LED light bulbs, RFI, and garage door opener
Chamberlain has a PDF guide listing LED bulb compatibility, which includes your unit.  More specifically, it lists:

|-----------|---------------------------------|--------------|
|           |                                 | Incandescent |
| Make      | Model                           | equivalent   |
|-----------|---------------------------------|--------------|
| Phillips  | 425256                          |      40w     |
| ECO SMART | ECS A19CW 60W E120              |      60W     |
| ECO SMART | ECS GP19 W27 40WE FR 120 DG 2PK |      40W     |
| CREE      | BA19-04527OMF-12DE26-2U100      |      40W     |
| 3M        | RRA19B4                         |      60W     |
| Sylvania  | 72554                           |      60W     |
| FEIT      | BPAG800DM-LED                   |      60W     |
| FEIT      | R20_DM_LED                      |      45W     |
|-----------|---------------------------------|--------------|


That guide is from January 2014, so more bulbs may be compatible, but it doesn't look like they've issued anything more recent.