Youngmafbog is correct in that the lights you sell must be CE marked.
In CE marking the product you are effectively declaring that the product meets all applicable directives.
The two main directives applicable are the Low Voltage Directive (2014/35/EU) and the RoHS Directive (2011/65/EU).
For each light model that you sell, you should have a technical construction file, which amongst other things will demonstrate how the product complies with all applicable directives.
For the purposes of meeting the LVD, compliance with the Luminaires standard EN 60598-1 may be sufficient – but other standards may be applicable depending of the type of construction.
For the purposes of meeting the RoHS Directive it is possible to use the declarations from your component suppliers – but there are risks in this strategy since you are relying on someone else’s declaration (it is unlikely that you will be able to show that a skateboard or vinyl record is RoHS compliant).
I’m not an expert on EN 60598-1, but from the little knowledge I have – there is virtually no chance whatsoever that a lamp made from a skateboard or a vinyl record will meet the requirements of the standard.
Sorry to be a party-pooper, but I would strongly advise that you give up this sideline before someone sues you for every penny you have.
Link for info on RoHS
https://www.conformance.co.uk/adirectives/doku.php?id=rohs
Link to info on LVD
https://www.conformance.co.uk/adirectives/doku.php?id=lowvoltage