Bei dieser Frage geht es tatsächlich schon über ...

UV light is not mandatory, very few indoor grows use any actual UVB. The photoreceptor UVR8 peak absorption occurs at 280-290nm with 90+% response occurring between those wavelengths. 90% of uv lights that claim they are UVB are actually 290-310nm and therefore about 10x less srress response than a fluorescent quartz at 280-290nm. But shhhh its a secret. UVB cannot pass through standard plastic nor glass, only quartz glass. UVA on the other hand 40-70% passes through glass and plastic and creates alot of reactive oxygen species in doing so. You do not need UVB for a plant to grow, but UVB is generally responsible for the "stress-induced" quality boosts (potency, defense mechanisms). Having only high UVA is not useless, but it won't produce the same, high-potency, defensive reactions as a balanced UV mix, and too much will just cause burn and stress. Infrared (IR) radiation—experienced as intense heat—is arguably the biggest stealth killer and stressor for windowsill plants, often more damaging than too much light. 45% of all light from sun is IR. Save the money and skip the 65w useless light, and invest in a small fan to keep her 😎 while she chills on the windows. The idea that windows grows yield is affected by UV is innacurate and misleading.