The invention relates to a light source comprising a light-emitting
element, which emits light in a first spectral region, and comprising a
luminophore, which comes from the group of alkaline-earth orthosilicates
and which absorbs a portion of the light emitted by the light source and
emits light in another spectral region. According to the invention, the
luminophore is an alkaline-earth orthosilicate, which is activated with
bivalent europium and whose composition consists of: (2-x-y)SrOx(Ba,
Ca)O(1-a-b-c-d)SiO.sub.2 aP.sub.2 O.sub.5 bAl.sub.2 O.sub.3 cB.sub.2
O.sub.3 dGeO.sub.2 :yEu.sup.2+ and/or (2-x-y)BaOx((Sr,
Ca)O(1-a-b-c-d)SiO.sub.2 aP.sub.2 O.sub.5 bAl.sub.2 O.sub.3 cB.sub.2
O.sub.3 dGeO.sub.2 :yEu.sup.2+. The desired color (color temperature) can
be easily adjusted by using a luminophore of the aforementioned type. The
light source can contain an additional luminophore selected from the group
of alkaline-earth aluminates, activated with bivalent europium and/or
manganese, and/or can contain an additional red-emitting luminophore
selected from the group Y(V, P, Si)O.sub.4 :Eu or can contain
alkaline-earth magnesium disilicate.
