The Solis Tek 400W MH SE 4K Daylight Lamp is a single‑ended metal halide grow bulb in the brand’s 4K (Daylight) spectrum. Retail listings identify the exact SKU as ST400MH4K and show a cylindrical, clear‑envelope MH lamp. The “4K” designation corresponds to approximately 4000 K correlated color temperature per common HID nomenclature and comparable 4K MH specifications. As a 400‑watt HID source, typical footprint is about 4 × 4 ft when paired with an appropriate reflector and hung at the proper height. One retailer notes the lamp uses low‑iron glass to improve UVA/UVB transmission compared to standard envelopes. This listing is for the bulb only; pair with a compatible MH system and reflector for use.
