I'm sharing links to Elgo resources (datasheets and manuals are in zip archives) found on Wayback Machine.

Datasheets
Accesories
https://web.archive.org/web/20170204095124/http://elgo-li.pl/pdf/karty/elgo/Akcesoria_i_mechanizmy_do_opraw.zip

Floodlights
https://web.archive.org/web/20140410072021/http://elgo.pl/pdf/karty/elgo/Naswietlacze_LED.zip

Lamp holders
https://web.archive.org/web/20140410074627/http://elgo.pl/pdf/karty/elgo/oprawki.zip

Architectural fixtures
https://web.archive.org/web/20140410075917/http://elgo.pl/pdf/karty/elgo/oprawy_architektoniczne.zip
https://web.archive.org/web/20150321202951/http://brilum.pl/pdf/karty/elgo/oprawy_architektoniczne_LED.zip

Emergency fixtures
https://web.archive.org/web/20150322005206/http://brilum.pl/pdf/karty/elgo/Oprawy_oswietlenia_awaryjnego.zip
https://web.archive.org/web/20150321203333/http://brilum.pl/pdf/karty/elgo/Oprawy_oswietlenia_awaryjnego_LED.zip

Indoor fixtures
https://web.archive.org/web/20170204093117/http://elgo-li.pl/pdf/karty/elgo/oprawy_biurowe.zip
https://web.archive.org/web/20170204115359/http://elgo-li.pl/pdf/karty/elgo/oprawy_biurowe_LED.zip

Fixtures for plant grow
https://web.archive.org/web/20150322002208/http://brilum.pl/pdf/karty/elgo/Oprawy_do_doswietlania_roslin.zip

Street fixtures
https://web.archive.org/web/20150322003954/http://brilum.pl/pdf/karty/elgo/oprawy_drogowe.zip
https://web.archive.org/web/20150321172918/http://brilum.pl/pdf/karty/elgo/oprawy_drogowe_LED.zip

Park fixtures
https://web.archive.org/web/20150321161203/http://brilum.pl/pdf/karty/elgo/oprawy_parkowe.zip
https://web.archive.org/web/20150321203047/http://brilum.pl/pdf/karty/elgo/oprawy_parkowe_LED.zip

Industrial fixtures
https://web.archive.org/web/20170204075517/http://elgo-li.pl/pdf/karty/elgo/oprawy_przemyslowe.zip
https://web.archive.org/web/20170204174811/http://elgo-li.pl/pdf/karty/elgo/oprawy_przemyslowe_LED.zip

Ballasts
https://web.archive.org/web/20170204172343/http://elgo-li.pl/pdf/karty/elgo/stateczniki.zip

Electronic transformers for low-voltage LEDs and halogens
https://web.archive.org/web/20150322003135/http://brilum.pl/pdf/karty/elgo/transformatory_elektroniczne.zip

Power limiter units
https://web.archive.org/web/20150321171429/http://brilum.pl/pdf/karty/elgo/uklady_redukcji_mocy.zip

Ignitors
https://web.archive.org/web/20150321164245/http://brilum.pl/pdf/karty/elgo/uklady_zaplonowe.zip

LED power supply
https://web.archive.org/web/20150321162517/http://brilum.pl/pdf/karty/elgo/uklady_zasilania.zip


Manuals
Accesories
https://web.archive.org/web/20170204172646/http://elgo-li.pl/pdf/instr/elgo/akcesoria.zip

Architectural fixtures
https://web.archive.org/web/20140404034015/http://elgo.pl/pdf/instr/elgo/oprawy_architektoniczne.zip
https://web.archive.org/web/20150316002826/http://brilum.pl/pdf/instr/elgo/oprawy_architektoniczne_LED.zip

Emergency fixtures
https://web.archive.org/web/20140404045935/http://elgo.pl/pdf/instr/elgo/oprawy_awaryjne.zip
https://web.archive.org/web/20140404033531/http://elgo.pl/pdf/instr/elgo/oprawy_awaryjne_LED.zip

Fixtures for plant grow
https://web.archive.org/web/20150316012655/http://brilum.pl/pdf/instr/elgo/oprawy_do_doswietlania_roslin.zip

Street fixtures
https://web.archive.org/web/20170204114035/http://elgo-li.pl/pdf/instr/elgo/oprawy_drogowe.zip
https://web.archive.org/web/20150315234936/http://brilum.pl/pdf/instr/elgo/oprawy_drogowe_LED.zip

Park fixtures
https://web.archive.org/web/20150315234651/http://brilum.pl/pdf/instr/elgo/oprawy_parkowe.zip
https://web.archive.org/web/20170204115320/http://elgo-li.pl/pdf/instr/elgo/oprawy_parkowe_LED.zip

Industrial fixtures
https://web.archive.org/web/20140404044157/http://elgo.pl/pdf/instr/elgo/oprawy_przemyslowe.zip
https://web.archive.org/web/20140404050418/http://elgo.pl/pdf/instr/elgo/oprawy_przemyslowe_LED.zip

Floodlights, street fixtures
https://web.archive.org/web/20170204112053/http://elgo-li.pl/pdf/instr/elgo/oprawy_zewnetrzne_LED.zip

Electronic transformers, power limiter units
https://web.archive.org/web/20150316010715/http://brilum.pl/pdf/instr/elgo/osprzet_elektrotechniczny.zip


Catalogs
https://web.archive.org/web/20150316195238/http://brilum.pl/pdf/catalog/katalog_ELGO_2012.pdf
https://web.archive.org/web/20150316195917/http://brilum.pl/pdf/catalog/led/Katalog_LED_PL.pdf
https://web.archive.org/web/20150322165143/http://brilum.pl/pdf/catalog/program_podstawowy/Program_podstawowy_ELGO_2014_1.2.pdf
https://web.archive.org/web/20020129201522/http://elgo.pl/english/oferta/katalog.html (many subpages have missing images)


Brochures
Street fixtures: https://web.archive.org/web/20060519020714/http://www.elgo.pl/files/pdfs/broszury/pl/drogowe.pdf
Park fixtures: https://web.archive.org/web/20060519020620/http://www.elgo.pl/files/pdfs/broszury/pl/parkowe.pdf
Industrial fixtures: https://web.archive.org/web/20060519020815/http://www.elgo.pl/files/pdfs/broszury/pl/specjalistyczne.pdf
Indoor fixtures: https://web.archive.org/web/20060519020738/http://www.elgo.pl/files/pdfs/broszury/pl/wnetrzowe.pdf


Bulletins
https://web.archive.org/web/20060518234141/http://www.elgo.pl/files/pdfs/biuletyny/pl/elgo-info_1_2004.pdf
https://web.archive.org/web/20060518234151/http://www.elgo.pl/files/pdfs/biuletyny/pl/elgo-info_2_2004.pdf