| Answer | Crossword Clue |
|---|---|
| OILLAMPS | Antique sources of light |
| LAMPS | Sources of light. |
| BULBS | Sources of light |
| LAMPS | Sources of light or heat |
| RADIANTS | Sources of heat or light |
| photomultiplier | An instrument containing a photoelectric cell and a series of electrodes, used to detect and amplify the light from very faint sources |
