Mona Lisa Projector
A Led lamp has been exclusively designed with the purpose of giving the highest lighting quality to Mona Lisa painting. This new design has been financed by the (well-known) Japanese firm Toshiba. The new lamp has been installed in a shelf designed by the room’s architect (Lorenzo Piqueras, 2005) . This system works upwards and is composed of 34 LEDs (single chip and multi chips. It replaces the former 7 LED lamp that had been working since 2005. Three optical systems have been developed in order to obtain high illuminance uniformity on the painting: primary optics on the LEDs, a “Scheib” mixing the colours, and a third system consisting of a double lens with an integrated filter, focusing the light on the painting and regulating its quality. A framer was also incorporated. The other aim of this lamp is to control freely the colour temperatures, keeping a high CRI (>95) with a maximum Gamut Area (in relation to the scientific research of the International Lighting Commission).
- Features
| Parameters | Specifications | TOSHIBA Lamp (English) |
|---|---|---|
| CCT with high CRI | 2700 to 3800 K | Adjustable from 2700 K until 3800 K 3200K selected for Mona Lisa |
| Colour shift from locus | N/A | Adjustable from -0,02 to 0,01 |
| Luminous Flux (lm) | N/A | 88 lm selected from Mona Lisa (can be boosted to 400 lm) |
| CRI | > 90 | CRI between 95 and 98 when on locus |
| Colour Quality Scale (CQS) | > 85 | > 95 for Mona Lisa > 85 maintained for various CCT between 2700 K and 3800 K |
| Ultra Violet radiation | < 5 μW/lm | <3 μW/lm |
| Infra-Red Radiation | < 0.1 W | < 0.05W |
| Uniformity on painting Emin/Eaverage | > 0.6 | 0,85 (with 16 points) > 0,92 with ambient lighting |
| Vertical Uniformity on painting | > 0.9 | 0,93 Ehalf top over Eaverage |
| Average Illuminance | 100-250 lx spot + ambient | 180 lx on glass / 108 lx on painting (spot only) |
| Luminous Flux projected outside frame | <1% | < 0,5% |
| Lamp Life | >50 000 heures | ~ 80,000 hours |