U.S. Philips Corporation

Martinus J Van Heel

Bauke J Roelevink

Theodorus F Lamboo

Petrus J Willemsen

Low-pressure mercury vapor discharge lamp with an emission spectrum according to a spectral energy distribution comprising the wavelength ranges 380-490 nm, 490-590 nm, and 590-700 nm, within which wavelength ranges mutually equal or substantially equal quantities of energy are emitted with a tolerance of 25% for the mutual ratios of equal energy of 1:1:1.

Low-pressure mercury vapor discharge lamp suitable for illuminating a

The invention relates to a low-pressure mercury vapor discharge lamp having a tubular discharge vessel which is sealed in a vacuum-tight manner, a filamentary body, consisting for example of glass wool, which is thinly distributed over the volume of the discharge vessel being provided near the electrodes to increase the radiance in those portions of the discharge vessel.

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Roosendaal, Netherlands

Martinus J Van Heel