![](https://scanoptics.com.au/wp-content/uploads/2015/08/SO-531A-lamp-pack-for-161-SO-111-400x311.jpg)
SO-531A
20W lamp and fuse pack of five suitable for old halogen ver SO-111, SO-151 and SO-161 microsocpes.
![](https://scanoptics.com.au/wp-content/uploads/2015/08/SO-531B-lamp-pack-for-SO-5000-5800-400x332.jpg)
SO-531B
50W lamp pack of five suitable for old halogen ver SO-111R and SO-111W microscopes
![](https://scanoptics.com.au/wp-content/uploads/2015/08/SO-531C-400x267.jpg)
SO-531C
50W lamp and fuse pack of five suitable for old halogen ver SO-111R and SO-111W microscopes