Sunmaster Grow Lamps

Sunmaster grow lamps offer excellent performance at a competitive price point, making them one of the most popular lamp choices for UK hobbyist growers. Sunmaster’s range covers standard HPS, Metal Halide, dual-spectrum and CDM configurations — providing flexibility across all stages of plant growth and multiple ballast types. At The Horticulture Company, we stock a selection of Sunmaster lamps to suit common UK grow room setups.
Sunmaster HPS and Dual-Spectrum Lamps
Sunmaster’s standard HPS lamps deliver solid lumen output in the proven red-orange spectrum ideal for flowering. Their Warm Deluxe dual-spectrum lamps are particularly popular — these modified HPS bulbs include additional blue-spectrum output, making them effective for both vegetative growth and flowering in a single lamp. This is especially useful for growers who run a single lamp for the entire lifecycle without switching from MH to HPS.
Sunmaster dual-spectrum lamps are a cost-effective alternative to investing in separate MH and HPS bulbs for a two-lamp system. They work particularly well in 600W digital ballasts and are compatible with all major ballast brands including Lumatek, Maxibright and Dimlux.
Sunmaster Metal Halide Lamps
Sunmaster’s Metal Halide range provides the blue-heavy spectrum that drives compact vegetative growth, stronger internodal spacing and darker, richer leaf colour. These lamps are ideal as dedicated veg lights or for use during the first four to six weeks of an indoor grow before switching to HPS.
We stock Sunmaster lamps as an excellent value option backed by consistent quality control. Our team has been recommending them to budget-conscious UK growers since 2017. Browse the full Sunmaster range below and contact us if you need help matching a lamp to your existing ballast.