The Deep violet-blue bulbs largely filter out visible light. Longer UVA wavelengths get through the glass and are not blocked by the dark colored filter dye. Longer UVA wavelengths emitted by UV blacklights  are basically harmless. Although the hazard is not quite zero, it is generally quite negligible

Can somebody tell me a good shop to get large size UV lamps in KL? Cant seem to get any in Low Yat, no stock.. I wana rig some up in my bedroom to, set the mood