Light emitting arrangement with adjustable emission spectrum

A light emitting arrangement adapted to produce white output light and having an emission peak in the wavelength range of from 380 to 440 nm, comprising:

• at least one first light emitting element adapted to emit light of a first luminous intensity I1 and having an emission peak in a first wavelength range of from 440 to 460 nm;
• and
• at least one second light emitting element adapted to emit light of a second luminous intensity I2 and having an emission peak in a second wavelength range of from 380 to 440 nm,
• wherein said at least one first light emitting element and said at least one second light emitting element are independently controllable such that the second intensity of light emitted by said at least one second light emitting element can be adjusted independently of the first intensity of light emitted by the at least one first light emitting element,
• wherein a ratio A′ is defined as
• A
• ′
• =
• ∫
• 380
• 430
• ⁢
• E
• ⁡
• (
• λ
• )
• ⁢
• (
• 430
• -
• λ
• )
• ⁢
• d
• ⁢
• ⁢
• λ
• ∫
• 380
• 780
• ⁢
• E
• ⁡
• (
• λ
• )
• ⁢
• d
• ⁢
• ⁢
• λ
• ,
• wherein A′ is at least 0.6,
• light emitting arrangement further comprising:
• a controller operatively connected to said at least one first light emitting element and said at least one second light emitting element, said controller being capable of generating a first control signal to increase or decrease the first intensity I1 of the light emitted by said at least one first light emitting element, and a second control signal to increase or decrease, independently of said first control signal, the second intensity I2 of the light emitted by said at least one second light emitting element, such that the intensity ratio A′ is variable by means of said controller,
• wherein said controller is adapted to decrease the second intensity I2 relative to the first intensity I1, while the light emitting module is dimmed.