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To indicate what can be captured easily indoors while getting to grips with your equipment - the attached spectra were captured last night using a Star Analyser 100 grating and a QHY5 mono astro-camera. I used a 10 mm ball bearing to reflect the light source as a tiny pin-point of light against a matte black background, with my telescope and camera set up at the other end of the darkened room (about 9 metres away)
Fluorescent Tube: Note the intense mercury emission lines, and the "zero order" spike of the un-diffracted light source, used to calibrate my camera / grating set-up
Ditto (with Mercury Lines superimposed)
Halogen Globe: Note the typical "black body" continuous spectrum from an incandescent light
RGB "White" LED: Note the three overlapping peaks, corresponding to the Red, Green and Blue LED light sources in these older "white" LEDs
Brilliant White LED: This newer type uses a single intense Blue LED as the "driver", and a broad-spectrum phosphor which absorbs a lot of the Blue, and re-emits as a broad Green / Yellow / Red to produce a brilliant "white" light
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