The spectrum of color of this lamp is red and yellow, but with a big part of blue, so this lamp is essential for the phase of bloom! Philips illuminant are the most favoured lamps in the range of growers.
This illuminant can be used with a 250W HPS-ballast and a E40 socket.
The small picture shows the colour spectrum of the Sylvania Growlux. You can recognize a definit larger fraction of red light, which makes this illuminant a bloom-light. The very little fraction of blue colour in all "Grolux" illuminants is expanded ca. 30%. Though it is still small in relation to the entire spectrum, this blue light is affecting the blossoms very positively.
Socket/lighting base: E40
Color temperature: ~2050K
Luminos flux: 34000 lm
Illuminant voltage: 115V
Supply voltage: 220-240V
Illuminant power: 2.6A
luminous efficiency: 130lm/W
To increase the effect of the lamp, you should additionally assemble a reflector.