GB2211985B - Improvements in plant growth lamps - Google Patents

Improvements in plant growth lamps

Info

Publication number
GB2211985B
GB2211985B GB8825759A GB8825759A GB2211985B GB 2211985 B GB2211985 B GB 2211985B GB 8825759 A GB8825759 A GB 8825759A GB 8825759 A GB8825759 A GB 8825759A GB 2211985 B GB2211985 B GB 2211985B
Authority
GB
United Kingdom
Prior art keywords
plant growth
growth lamps
lamps
plant
growth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
GB8825759A
Other versions
GB2211985A (en
GB8825759D0 (en
Inventor
Robert Brian Page
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thorn EMI PLC
Original Assignee
Thorn EMI PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thorn EMI PLC filed Critical Thorn EMI PLC
Publication of GB8825759D0 publication Critical patent/GB8825759D0/en
Publication of GB2211985A publication Critical patent/GB2211985A/en
Application granted granted Critical
Publication of GB2211985B publication Critical patent/GB2211985B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/20—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent mercury vapour
GB8825759A 1987-11-05 1988-11-03 Improvements in plant growth lamps Expired - Lifetime GB2211985B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB878725913A GB8725913D0 (en) 1987-11-05 1987-11-05 Plant growth lamps

Publications (3)

Publication Number Publication Date
GB8825759D0 GB8825759D0 (en) 1988-12-07
GB2211985A GB2211985A (en) 1989-07-12
GB2211985B true GB2211985B (en) 1992-05-27

Family

ID=10626476

Family Applications (2)

Application Number Title Priority Date Filing Date
GB878725913A Pending GB8725913D0 (en) 1987-11-05 1987-11-05 Plant growth lamps
GB8825759A Expired - Lifetime GB2211985B (en) 1987-11-05 1988-11-03 Improvements in plant growth lamps

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB878725913A Pending GB8725913D0 (en) 1987-11-05 1987-11-05 Plant growth lamps

Country Status (1)

Country Link
GB (2) GB8725913D0 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420220B (en) * 2004-11-10 2009-10-14 Gen Electric Ceramic metal halide lamps

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1163446A (en) * 1965-10-23 1969-09-04 Philips Electronic Associated Mercury-Vapour Discharge Lamps
GB1585861A (en) * 1976-08-18 1981-03-11 Thorn Emi Ltd Metal halide lamps
EP0110645A2 (en) * 1982-11-30 1984-06-13 THORN EMI plc Improvements in photoprinting lamps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1163446A (en) * 1965-10-23 1969-09-04 Philips Electronic Associated Mercury-Vapour Discharge Lamps
GB1585861A (en) * 1976-08-18 1981-03-11 Thorn Emi Ltd Metal halide lamps
EP0110645A2 (en) * 1982-11-30 1984-06-13 THORN EMI plc Improvements in photoprinting lamps

Also Published As

Publication number Publication date
GB8725913D0 (en) 1987-12-09
GB2211985A (en) 1989-07-12
GB8825759D0 (en) 1988-12-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20041103