An illumination device (201a, 201b, 201c, 201d, 201 e, 201f, 301, 401, 501, 601, 701, 801, 901) comprising: o a first light source array (203, 303, 903) comprising at least a first light source; said first light source generates a first light beam having a first spectral distribution; said first light beam propagates primarily in a first direction along an optical axis (207, 307); o a second light source array (209, 309, 913) comprising at least a second light source, said second light source generates a second light beam having a second spectral distribution; o a first dichroic reflector (211, 311, 511, 611, 711, 811 a) positioned at least partially in said first light beam and said second light beam; said first dichroic reflector transmits at least a part of said first light beam and reflects at least a part of said second light beam; characterized in ∘ that said second light beam propagates primarily in a second direction along said optical axis (207, 307) and substantially opposite said first direction and directly towards at least a part of said first light source array prior to being reflected by said dichroic reflector and where the angle between said second light beam and said optical axis is smaller than 33 degrees; ∘ that at least a part of said second light beam propagates primarily in said first direction after being reflected by said first dichroic reflector (211, 311, 511, 611, 711, 811a); ∘ that said illumination device comprises at least a third light source generating a third light beam having a third spectral distribution; ∘ that at least said first array of light sources comprises at least a fourth light source generating a fourth light beam having a fourth spectral distribution, said fourth light beam propagates primarily in said first direction and that said fourth spectral distribution is a spectrally broadly distributed white light; and ∘ at least a part of said white light beam does not hit said first dichroic reflector. o a first light source array (203, 303, 903) comprising at least a first light source; said first light source generates a first light beam having a first spectral distribution; said first light beam propagates primarily in a first direction along an optical axis (207, 307); o a second light source array (209, 309, 913) comprising at least a second light source, said second light source generates a second light beam having a second spectral distribution; o a first dichroic reflector (211, 311, 511, 611, 711, 811 a) positioned at least partially in said first light beam and said second light beam; said first dichroic reflector transmits at least a part of said first light beam and reflects at least a part of said second light beam; ∘ that said second light beam propagates primarily in a second direction along said optical axis (207, 307) and substantially opposite said first direction and directly towards at least a part of said first light source array prior to being reflected by said dichroic reflector and where the angle between said second light beam and said optical axis is smaller than 33 degrees; ∘ that at least a part of said second light beam propagates primarily in said first direction after being reflected by said first dichroic reflector (211, 311, 511, 611, 711, 811a); ∘ that said illumination device comprises at least a third light source generating a third light beam having a third spectral distribution; ∘ that at least said first array of light sources comprises at least a fourth light source generating a fourth light beam having a fourth spectral distribution, said fourth light beam propagates primarily in said first direction and that said fourth spectral distribution is a spectrally broadly distributed white light; and ∘ at least a part of said white light beam does not hit said first dichroic reflector.