I have the fairy lights in the indoor use and a mere 1.5 hours is still encountered no excessive heating of the power supply, as is apparently occurred every now and then in this product. Possibly the power supply has been rectified or it was the outdoor use. But the string of lights does not seem appropriate: the diodes are not sealed against moisture and the plug connection of the fairy lights to the power supply does not look waterproof. The light can be truly described as warm white (only with a slightly higher color temperature than conventional lights - with me are just both used in parallel, therefore good possibility of comparison), I find it very enjoyable. 200 LEDs are sufficient for a 2 m tall tree good, 160 would do it if need be. Sign up now to light up all the LED's (would be bad, after 1.5 h). So first there is a perfect score.